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102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
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* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
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* Internet Initiative Japan, Inc (IIJ)
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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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/* Operations - f_srcop, f_dstop */
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#define OP_NONE 0
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#define OP_EQ 1
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#define OP_GT 2
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#define OP_LT 3
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/* srctype or dsttype */
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#define T_ADDR 0
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#define T_MYADDR 1
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#define T_MYADDR6 2
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#define T_HISADDR 3
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#define T_HISADDR6 4
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#define T_DNS0 5
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#define T_DNS1 6
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/*
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* There's a struct filterent for each possible filter rule. The
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* layout is designed to minimise size (there are 4 * MAXFILTERS of
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* them) - which is also conveniently a power of 2 (32 bytes) on
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* architectures where sizeof(int)==4 (this makes indexing faster).
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*
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* Note that there are four free bits in the initial word for future
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* extensions.
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*/
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struct filterent {
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int f_proto; /* Protocol: getprotoby*() */
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unsigned f_action : 8; /* Filtering action: goto or A_... */
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unsigned f_srcop : 2; /* Source port operation: OP_... */
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unsigned f_dstop : 2; /* Destination port operation: OP_... */
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unsigned f_srctype : 3; /* T_ value of src */
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unsigned f_dsttype : 3; /* T_ value of dst */
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unsigned f_estab : 1; /* Check TCP ACK bit */
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unsigned f_syn : 1; /* Check TCP SYN bit */
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unsigned f_finrst : 1; /* Check TCP FIN/RST bits */
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unsigned f_invert : 1; /* true to complement match */
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struct ncprange f_src; /* Source address and mask */
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struct ncprange f_dst; /* Destination address and mask */
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u_short f_srcport; /* Source port, compared with f_srcop */
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u_short f_dstport; /* Destination port, compared with f_dstop */
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unsigned timeout; /* Keep alive value for passed packet */
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};
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#define MAXFILTERS 40 /* in each filter set */
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/* f_action values [0..MAXFILTERS) specify the next filter rule, others are: */
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#define A_NONE (MAXFILTERS)
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#define A_PERMIT (A_NONE+1)
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#define A_DENY (A_PERMIT+1)
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struct filter {
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struct filterent rule[MAXFILTERS]; /* incoming packet filter */
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const char *name;
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unsigned fragok : 1;
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unsigned logok : 1;
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};
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/* Which filter set */
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#define FL_IN 0
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#define FL_OUT 1
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#define FL_DIAL 2
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#define FL_KEEP 3
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struct ipcp;
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struct cmdargs;
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extern int filter_Show(struct cmdargs const *);
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extern int filter_Set(struct cmdargs const *);
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extern const char * filter_Action2Nam(unsigned);
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extern const char *filter_Op2Nam(unsigned);
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extern void filter_AdjustAddr(struct filter *, struct ncpaddr *,
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struct ncpaddr *, struct in_addr *);
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