mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-14 10:09:48 +00:00
248 lines
6.3 KiB
Groff
248 lines
6.3 KiB
Groff
.\" Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
|
|
.\" 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. Neither the name of the project nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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.
|
|
.\"
|
|
.\" $Id: ipsec_set_policy.3,v 1.5 1999/10/20 00:21:06 sakane Exp $
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd May 5, 1998
|
|
.Dt IPSEC_SET_POLICY 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ipsec_set_policy ,
|
|
.Nm ipsec_get_policylen ,
|
|
.Nm ipsec_dump_policy
|
|
.Nd manipulate IPsec policy specification structure from readable string
|
|
.Sh LIBRARY
|
|
.Lb libipsec
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/types.h>
|
|
.Fd #include <netinet6/ipsec.h>
|
|
.Ft "char *"
|
|
.Fn ipsec_set_policy "char *policy" "int len"
|
|
.Ft int
|
|
.Fn ipsec_get_policylen "char *buf"
|
|
.Ft "char *"
|
|
.Fn ipsec_dump_policy "char *buf" "char *delim"
|
|
.Sh DESCRIPTION
|
|
.Fn ipsec_set_policy
|
|
generates IPsec policy specification structure, namely
|
|
.Li struct sadb_x_policy
|
|
and/or
|
|
.Li struct sadb_x_ipsecrequest
|
|
from human-readable policy specification.
|
|
policy specification must be given as C string
|
|
.Fa policy
|
|
and length
|
|
.Fa len
|
|
of
|
|
.Fa policy .
|
|
.Fn ipsec_set_policy
|
|
will return the buffer of IPsec policy specification structure.
|
|
.Pp
|
|
You may want the length of the generated buffer such when calling
|
|
.Xr setsockopt 2 .
|
|
.Fn ipsec_get_policylen
|
|
will return the length.
|
|
.Pp
|
|
.Fn ipsec_dump_policy
|
|
converts IPsec policy structure into readable form.
|
|
Therefore,
|
|
.Fn ipsec_dump_policy
|
|
can be regarded as inverse conversion of
|
|
.Fn ipsec_set_policy .
|
|
.Fa buf
|
|
points to a IPsec policy structure,
|
|
.Li struct sadb_x_policy .
|
|
.Fa delim
|
|
is a delimiter string, which is usually a blank character.
|
|
If you set
|
|
.Fa delim
|
|
to
|
|
.Dv NULL ,
|
|
single whitespace is assumed.
|
|
.Fn ipsec_dump_policy
|
|
returns pointer to dynamically allocated string.
|
|
It is caller's responsibility to reclaim the region, by using
|
|
.Xr free 3 .
|
|
.Pp
|
|
.Fa policy
|
|
is formatted as either of the following:
|
|
.Bl -tag -width "discard"
|
|
.It Ar direction Li entrust
|
|
.Ar direction
|
|
must be
|
|
.Li in
|
|
or
|
|
.Li out .
|
|
.Ar direction
|
|
specifies which direction the policy needs to be applied.
|
|
.Li entrust
|
|
means to consult to SPD defined by
|
|
.Xr setkey 8 .
|
|
.It Ar direction Li bypass
|
|
.Li bypass
|
|
means to be bypassed the IPsec processing.
|
|
.Pq packet will be transmitted in clear .
|
|
This is for privileged socket.
|
|
.It Xo
|
|
.Ar direction
|
|
.Li ipsec
|
|
.Ar request ...
|
|
.Xc
|
|
.Li ipsec
|
|
means that the matching packets are subject to IPsec processing.
|
|
.Li ipsec
|
|
can be followed by one or more
|
|
.Ar request
|
|
string, which is formatted as below:
|
|
.Bl -tag -width "discard"
|
|
.It Xo
|
|
.Ar protocol
|
|
.Li /
|
|
.Ar mode
|
|
.Li /
|
|
.Ar src
|
|
.Li -
|
|
.Ar dst
|
|
.Op Ar /level
|
|
.Xc
|
|
.Ar protocol
|
|
is either
|
|
.Li ah ,
|
|
.Li esp
|
|
or
|
|
.Li ipcomp .
|
|
.Pp
|
|
.Ar mode
|
|
is either
|
|
.Li transport
|
|
or
|
|
.Li tunnel .
|
|
.Pp
|
|
.Ar src
|
|
and
|
|
.Ar dst
|
|
specifies IPsec endpoint.
|
|
.Ar src
|
|
always means
|
|
.Dq sending node
|
|
and
|
|
.Ar dst
|
|
always means
|
|
.Dq receiving node .
|
|
Therefore, when
|
|
.Ar direction
|
|
is
|
|
.Li in ,
|
|
.Ar dst
|
|
is this node
|
|
and
|
|
.Ar src
|
|
is the other node
|
|
.Pq peer .
|
|
.Pp
|
|
.Ar level
|
|
must be set to one of the following:
|
|
.Li default , use
|
|
or
|
|
.Li require .
|
|
.Li default
|
|
means that the kernel should consult the system default policy
|
|
defined by
|
|
.Xr sysctl 8 ,
|
|
such as
|
|
.Li net.inet.ipsec.esp_trans_deflev .
|
|
See
|
|
.Xr ipsec 4
|
|
regarding the system default.
|
|
.Li use
|
|
means that a relevant SA can be used when available,
|
|
since the kernel may perform IPsec operation against packets when possible.
|
|
In this case, packets can be transmitted in clear
|
|
.Pq when SA is not available ,
|
|
or encrypted
|
|
.Pq when SA is available .
|
|
.Li require
|
|
means that a relevant SA is required,
|
|
since the kernel must perform IPsec operation against packets.
|
|
If the
|
|
.Ar request
|
|
string is kept unambiguous,
|
|
.Ar level
|
|
and slash prior to
|
|
.Ar level
|
|
can be omitted.
|
|
However, it is encouraged to specify them explicitly
|
|
to avoid unintended behaviors.
|
|
If
|
|
.Ar level
|
|
is omitted, it will be interpreted as
|
|
.Li default .
|
|
.El
|
|
.El
|
|
.Pp
|
|
Note that there is a bit difference of specification from
|
|
.Xr setkey 8 .
|
|
In specification by
|
|
.Xr setkey 8 ,
|
|
both entrust and bypass are not used. Refer to
|
|
.Xr setkey 8
|
|
for detail.
|
|
.Pp
|
|
Here are several examples
|
|
.Pq long lines are wrapped for readability :
|
|
.Bd -literal -offset indent
|
|
in discard
|
|
out ipsec esp/transport/10.1.1.1-10.1.1.2/require
|
|
in ipsec ah/transport/10.1.1.2-10.1.1.1/require
|
|
in ipsec esp/transport/10.1.1.2-10.1.1.1/use
|
|
ah/tunnel/10.1.1.2-10.1.1.1/require
|
|
in ipsec ipcomp/transport/10.1.1.2-10.1.1.1/use
|
|
esp/transport/10.1.1.2-10.1.1.1/use
|
|
.Ed
|
|
.Sh RETURN VALUES
|
|
.Fn ipsec_set_policy
|
|
returns a pointer to the allocated buffer of policy specification if successful; otherwise a NULL pointer is returned.
|
|
.Fn ipsec_get_policylen
|
|
returns with positive value
|
|
.Pq meaning the buffer size
|
|
on success, and negative value on errors.
|
|
.Fn ipsec_dump_policy
|
|
returns a pointer to dynamically allocated region on success,
|
|
and
|
|
.Dv NULL
|
|
on errors.
|
|
.Sh SEE ALSO
|
|
.Xr ipsec_strerror 3 ,
|
|
.Xr ipsec 4 ,
|
|
.Xr setkey 8
|
|
.Sh HISTORY
|
|
The functions first appeared in WIDE/KAME IPv6 protocol stack kit.
|
|
IPv6 and IPsec support based on the KAME Project (http://www.kame.net/) stack
|
|
was initialy integrated into
|
|
.Fx 4.0
|