Add pfil(9) subroutines and manpage from NetBSD.
This commit is contained in:
Darren Reed
parent
9d14d898fd
commit
e9c7bebf95
134
share/man/man9/pfil.9
Normal file
134
share/man/man9/pfil.9
Normal file
@ -0,0 +1,134 @@
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.\" $FreeBSD$
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.\"
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.\" Copyright (c) 1996 Matthew R. Green
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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||||||
|
.\" modification, are permitted provided that the following conditions
|
||||||
|
.\" are met:
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||||||
|
.\" 1. Redistributions of source code must retain the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer.
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||||||
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer in the
|
||||||
|
.\" documentation and/or other materials provided with the distribution.
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||||||
|
.\" 3. The name of the author may not be used to endorse or promote products
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||||||
|
.\" derived from this software without specific prior written permission.
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||||||
|
.\"
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||||||
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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||||||
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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||||||
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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||||||
|
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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||||||
|
.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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||||||
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd August 4, 1996
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.Dt PFIL 9
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.Os
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.Sh NAME
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.Nm pfil ,
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.Nm pfil_hook_get ,
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.Nm pfil_add_hook ,
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.Nm pfil_remove_hook
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.Nd packet filter interface
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.Sh SYNOPSIS
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.Fd #include <sys/param.h>
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.Fd #include <sys/mbuf.h>
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.Fd #include <net/if.h>
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.Fd #include <net/pfil.h>
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.Ft struct packet_filter_hook *
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.Fn pfil_hook_get "int" "struct pfil_head *"
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.Ft void
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.Fn pfil_add_hook "int (*func)()" "int flags" "struct pfil_head *"
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.Ft void
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.Fn pfil_remove_hook "int (*func)()" "int flags" "struct pfil_head *"
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.\"(void *, int, struct ifnet *, int, struct mbuf **)
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.Sh DESCRIPTION
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The
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.Nm
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interface allows a function to be called on every incoming or outgoing
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packets. The hooks for these are embedded in the
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.Fn ip_input
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and
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.Fn ip_output
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routines. The
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.Fn pfil_hook_get
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function returns the first member of a particular hook, either the in or out
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list. The
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.Fn pfil_add_hook
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function takes a function of the form below as it's first argument, and the
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flags for which lists to add the function to. The possible values for these
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flags are some combination of PFIL_IN and PFIL_OUT. The
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.Fn pfil_remove_hook
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removes a hook from the specified lists.
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.Pp
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The
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.Va func
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argument is a function with the following prototype.
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.Pp
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.Fn func "void *data" "int hlen" "struct ifnet *net" "int dir" "struct mbuf **m"
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.Pp
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The
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.Va data
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describes the packet. Currently, this may only be a pointer to a ip structure. The
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.Va net
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and
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.Va m
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arguments describe the network interface and the mbuf holding data for this
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packet. The
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.Va dir
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is the direction; 0 for incoming packets and 1 for outgoing packets. if the function
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returns non-zero, this signals an error and no further processing of this packet is
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performed. The function should set errno to indicate the nature of the error.
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It is the hook's responsibiliy to free the chain if the packet is being dropped.
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.Pp
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The
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.Nm
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interface is enabled in the kernel via the
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.Sy PFIL_HOOKS
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option.
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.Sh RETURN VALUES
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If successful
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.Fn pfil_hook_get
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returns the first member of the packet filter list,
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.Fn pfil_add_hook
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and
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.Fn pfil_remove_hook
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are expected to always succeed.
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.Sh HISTORY
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The
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.Nm
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interface first appeared in
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.Nx 1.3 .
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The
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.Nm
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input and output lists were originally implemented as
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.Fd <sys/queue.h>
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.Dv LIST
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structures;
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however this was changed in
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.Nx 1.4
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to
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.Dv TAILQ
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structures. This change was to allow the input and output filters to be
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processed in reverse order, to allow the same path to be taken, in or out
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of the kernel.
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.Pp
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The
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.Nm
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interface was changed in 1.4T to accept a 3rd parameter to both
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.Fn pfil_add_hook
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and
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.Fn pfil_remove_hook
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, introducing the capability of per-protocol filtering. This was done
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primarily in order to support filtering of IPv6.
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.Sh BUGS
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The current
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.Nm
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implementation will need changes to suit a threaded kernel model.
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.Sh SEE ALSO
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.Xr bpf 4
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134
sys/net/pfil.9
Normal file
134
sys/net/pfil.9
Normal file
@ -0,0 +1,134 @@
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.\" $FreeBSD$
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.\"
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.\" Copyright (c) 1996 Matthew R. Green
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.\" All rights reserved.
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.\"
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|
.\" Redistribution and use in source and binary forms, with or without
|
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|
.\" modification, are permitted provided that the following conditions
|
||||||
|
.\" are met:
|
||||||
|
.\" 1. Redistributions of source code must retain the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer.
|
||||||
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer in the
|
||||||
|
.\" documentation and/or other materials provided with the distribution.
|
||||||
|
.\" 3. The name of the author may not be used to endorse or promote products
|
||||||
|
.\" derived from this software without specific prior written permission.
|
||||||
|
.\"
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||||||
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||||||
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||||
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||||||
|
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||||
|
.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
|
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||||
|
.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||||
|
.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||||
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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|
.\" SUCH DAMAGE.
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.\"
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.Dd August 4, 1996
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.Dt PFIL 9
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.Os
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.Sh NAME
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.Nm pfil ,
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|
.Nm pfil_hook_get ,
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||||||
|
.Nm pfil_add_hook ,
|
||||||
|
.Nm pfil_remove_hook
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||||||
|
.Nd packet filter interface
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.Sh SYNOPSIS
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.Fd #include <sys/param.h>
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.Fd #include <sys/mbuf.h>
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.Fd #include <net/if.h>
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.Fd #include <net/pfil.h>
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.Ft struct packet_filter_hook *
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.Fn pfil_hook_get "int" "struct pfil_head *"
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.Ft void
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.Fn pfil_add_hook "int (*func)()" "int flags" "struct pfil_head *"
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.Ft void
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.Fn pfil_remove_hook "int (*func)()" "int flags" "struct pfil_head *"
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.\"(void *, int, struct ifnet *, int, struct mbuf **)
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.Sh DESCRIPTION
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||||||
|
The
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||||||
|
.Nm
|
||||||
|
interface allows a function to be called on every incoming or outgoing
|
||||||
|
packets. The hooks for these are embedded in the
|
||||||
|
.Fn ip_input
|
||||||
|
and
|
||||||
|
.Fn ip_output
|
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|
routines. The
|
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.Fn pfil_hook_get
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|
function returns the first member of a particular hook, either the in or out
|
||||||
|
list. The
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||||||
|
.Fn pfil_add_hook
|
||||||
|
function takes a function of the form below as it's first argument, and the
|
||||||
|
flags for which lists to add the function to. The possible values for these
|
||||||
|
flags are some combination of PFIL_IN and PFIL_OUT. The
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.Fn pfil_remove_hook
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removes a hook from the specified lists.
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.Pp
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|
The
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.Va func
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|
argument is a function with the following prototype.
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.Pp
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.Fn func "void *data" "int hlen" "struct ifnet *net" "int dir" "struct mbuf **m"
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.Pp
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The
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.Va data
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describes the packet. Currently, this may only be a pointer to a ip structure. The
|
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|
.Va net
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||||||
|
and
|
||||||
|
.Va m
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||||||
|
arguments describe the network interface and the mbuf holding data for this
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|
packet. The
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.Va dir
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|
is the direction; 0 for incoming packets and 1 for outgoing packets. if the function
|
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|
returns non-zero, this signals an error and no further processing of this packet is
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performed. The function should set errno to indicate the nature of the error.
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It is the hook's responsibiliy to free the chain if the packet is being dropped.
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.Pp
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The
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.Nm
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interface is enabled in the kernel via the
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.Sy PFIL_HOOKS
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option.
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.Sh RETURN VALUES
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If successful
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.Fn pfil_hook_get
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returns the first member of the packet filter list,
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.Fn pfil_add_hook
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and
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.Fn pfil_remove_hook
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are expected to always succeed.
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.Sh HISTORY
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The
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.Nm
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|
interface first appeared in
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|
.Nx 1.3 .
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|
The
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.Nm
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|
input and output lists were originally implemented as
|
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|
.Fd <sys/queue.h>
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.Dv LIST
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structures;
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|
however this was changed in
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.Nx 1.4
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to
|
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|
.Dv TAILQ
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||||||
|
structures. This change was to allow the input and output filters to be
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|
processed in reverse order, to allow the same path to be taken, in or out
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of the kernel.
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.Pp
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|
The
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.Nm
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|
interface was changed in 1.4T to accept a 3rd parameter to both
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.Fn pfil_add_hook
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|
and
|
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.Fn pfil_remove_hook
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, introducing the capability of per-protocol filtering. This was done
|
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|
primarily in order to support filtering of IPv6.
|
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.Sh BUGS
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||||||
|
The current
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||||||
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.Nm
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||||||
|
implementation will need changes to suit a threaded kernel model.
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.Sh SEE ALSO
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.Xr bpf 4
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176
sys/net/pfil.c
Normal file
176
sys/net/pfil.c
Normal file
@ -0,0 +1,176 @@
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/* $FreeBSD$ */
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/*
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* Copyright (c) 1996 Matthew R. Green
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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|
* modification, are permitted provided that the following conditions
|
||||||
|
* are met:
|
||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. The name of the author may not be used to endorse or promote products
|
||||||
|
* derived from this software without specific prior written permission.
|
||||||
|
*
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|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
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|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||||
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||||||
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||||
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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||||||
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||||
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||||
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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|
* SUCH DAMAGE.
|
||||||
|
*/
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <net/pfil.h>
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static void pfil_init __P((struct pfil_head *));
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static int pfil_list_add(pfil_list_t *,
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int (*) __P((void *, int, struct ifnet *, int, struct mbuf **)), int);
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static int pfil_list_remove(pfil_list_t *,
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int (*) __P((void *, int, struct ifnet *, int, struct mbuf **)));
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static void
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pfil_init(ph)
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struct pfil_head *ph;
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{
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TAILQ_INIT(&ph->ph_in);
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TAILQ_INIT(&ph->ph_out);
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ph->ph_init = 1;
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}
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/*
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* pfil_add_hook() adds a function to the packet filter hook. the
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* flags are:
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* PFIL_IN call me on incoming packets
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* PFIL_OUT call me on outgoing packets
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* PFIL_ALL call me on all of the above
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* PFIL_WAITOK OK to call malloc with M_WAITOK.
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*/
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int
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pfil_add_hook(func, flags, ph)
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int (*func) __P((void *, int, struct ifnet *, int,
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struct mbuf **));
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int flags;
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struct pfil_head *ph;
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{
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int err = 0;
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if (ph->ph_init == 0)
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pfil_init(ph);
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if (flags & PFIL_IN)
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err = pfil_list_add(&ph->ph_in, func, flags & ~PFIL_OUT);
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if (err)
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return err;
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if (flags & PFIL_OUT)
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err = pfil_list_add(&ph->ph_out, func, flags & ~PFIL_IN);
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if (err) {
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if (flags & PFIL_IN)
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pfil_list_remove(&ph->ph_in, func);
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return err;
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}
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return 0;
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}
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static int
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pfil_list_add(list, func, flags)
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pfil_list_t *list;
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int (*func) __P((void *, int, struct ifnet *, int,
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struct mbuf **));
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int flags;
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{
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struct packet_filter_hook *pfh;
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pfh = (struct packet_filter_hook *)malloc(sizeof(*pfh), M_IFADDR,
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flags & PFIL_WAITOK ? M_WAITOK : M_NOWAIT);
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if (pfh == NULL)
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return ENOMEM;
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pfh->pfil_func = func;
|
||||||
|
/*
|
||||||
|
* insert the input list in reverse order of the output list
|
||||||
|
* so that the same path is followed in or out of the kernel.
|
||||||
|
*/
|
||||||
|
|
||||||
|
if (flags & PFIL_IN)
|
||||||
|
TAILQ_INSERT_HEAD(list, pfh, pfil_link);
|
||||||
|
else
|
||||||
|
TAILQ_INSERT_TAIL(list, pfh, pfil_link);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* pfil_remove_hook removes a specific function from the packet filter
|
||||||
|
* hook list.
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
pfil_remove_hook(func, flags, ph)
|
||||||
|
int (*func) __P((void *, int, struct ifnet *, int,
|
||||||
|
struct mbuf **));
|
||||||
|
int flags;
|
||||||
|
struct pfil_head *ph;
|
||||||
|
{
|
||||||
|
int err = 0;
|
||||||
|
|
||||||
|
if (ph->ph_init == 0)
|
||||||
|
pfil_init(ph);
|
||||||
|
|
||||||
|
if (flags & PFIL_IN)
|
||||||
|
err = pfil_list_remove(&ph->ph_in, func);
|
||||||
|
if ((err == 0) && (flags & PFIL_OUT))
|
||||||
|
err = pfil_list_remove(&ph->ph_out, func);
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* pfil_list_remove is an internal function that takes a function off the
|
||||||
|
* specified list.
|
||||||
|
*/
|
||||||
|
static int
|
||||||
|
pfil_list_remove(list, func)
|
||||||
|
pfil_list_t *list;
|
||||||
|
int (*func) __P((void *, int, struct ifnet *, int,
|
||||||
|
struct mbuf **));
|
||||||
|
{
|
||||||
|
struct packet_filter_hook *pfh;
|
||||||
|
|
||||||
|
for (pfh = list->tqh_first; pfh; pfh = pfh->pfil_link.tqe_next)
|
||||||
|
if (pfh->pfil_func == func) {
|
||||||
|
TAILQ_REMOVE(list, pfh, pfil_link);
|
||||||
|
free(pfh, M_IFADDR);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
return ENOENT;
|
||||||
|
}
|
||||||
|
|
||||||
|
struct packet_filter_hook *
|
||||||
|
pfil_hook_get(flag, ph)
|
||||||
|
int flag;
|
||||||
|
struct pfil_head *ph;
|
||||||
|
{
|
||||||
|
if (ph->ph_init != 0)
|
||||||
|
switch (flag) {
|
||||||
|
case PFIL_IN:
|
||||||
|
return (ph->ph_in.tqh_first);
|
||||||
|
case PFIL_OUT:
|
||||||
|
return (ph->ph_out.tqh_first);
|
||||||
|
}
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
81
sys/net/pfil.h
Normal file
81
sys/net/pfil.h
Normal file
@ -0,0 +1,81 @@
|
|||||||
|
/* $FreeBSD$ */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Copyright (c) 1996 Matthew R. Green
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions
|
||||||
|
* are met:
|
||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. The name of the author may not be used to endorse or promote products
|
||||||
|
* derived from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||||||
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||||
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||||||
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||||
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||||
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||||
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||||
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||||
|
* SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef _NET_PFIL_H_
|
||||||
|
#define _NET_PFIL_H_
|
||||||
|
|
||||||
|
#include <sys/queue.h>
|
||||||
|
|
||||||
|
struct mbuf;
|
||||||
|
struct ifnet;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The packet filter hooks are designed for anything to call them to
|
||||||
|
* possibly intercept the packet.
|
||||||
|
*/
|
||||||
|
struct packet_filter_hook {
|
||||||
|
TAILQ_ENTRY(packet_filter_hook) pfil_link;
|
||||||
|
int (*pfil_func) __P((void *, int, struct ifnet *, int,
|
||||||
|
struct mbuf **));
|
||||||
|
int pfil_flags;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define PFIL_IN 0x00000001
|
||||||
|
#define PFIL_OUT 0x00000002
|
||||||
|
#define PFIL_WAITOK 0x00000004
|
||||||
|
#define PFIL_ALL (PFIL_IN|PFIL_OUT)
|
||||||
|
|
||||||
|
typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
|
||||||
|
|
||||||
|
struct pfil_head {
|
||||||
|
pfil_list_t ph_in;
|
||||||
|
pfil_list_t ph_out;
|
||||||
|
int ph_init;
|
||||||
|
} pfil_head_t;
|
||||||
|
|
||||||
|
struct packet_filter_hook *pfil_hook_get __P((int, struct pfil_head *));
|
||||||
|
int pfil_add_hook __P((int (*func) __P((void *, int,
|
||||||
|
struct ifnet *, int, struct mbuf **)), int, struct pfil_head *));
|
||||||
|
int pfil_remove_hook __P((int (*func) __P((void *, int,
|
||||||
|
struct ifnet *, int, struct mbuf **)), int, struct pfil_head *));
|
||||||
|
|
||||||
|
/* XXX */
|
||||||
|
#if defined(_KERNEL) && !defined(_LKM)
|
||||||
|
#include "ipfilter.h"
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#if NIPFILTER > 0
|
||||||
|
#ifdef PFIL_HOOKS
|
||||||
|
#undef PFIL_HOOKS
|
||||||
|
#endif
|
||||||
|
#define PFIL_HOOKS
|
||||||
|
#endif /* NIPFILTER */
|
||||||
|
|
||||||
|
#endif /* _NET_PFIL_H_ */
|
||||||
Loading…
x
Reference in New Issue
Block a user