1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/usr.sbin/ppp/filter.h,v 1.21.2.6 2002/09/01 02:12:27 brian Exp $ 29 * $DragonFly: src/usr.sbin/ppp/filter.h,v 1.2 2003/06/17 04:30:00 dillon Exp $ 30 */ 31 32 /* Operations - f_srcop, f_dstop */ 33 #define OP_NONE 0 34 #define OP_EQ 1 35 #define OP_GT 2 36 #define OP_LT 3 37 38 /* srctype or dsttype */ 39 #define T_ADDR 0 40 #define T_MYADDR 1 41 #define T_MYADDR6 2 42 #define T_HISADDR 3 43 #define T_HISADDR6 4 44 #define T_DNS0 5 45 #define T_DNS1 6 46 47 /* 48 * There's a struct filterent for each possible filter rule. The 49 * layout is designed to minimise size (there are 4 * MAXFILTERS of 50 * them) - which is also conveniently a power of 2 (32 bytes) on 51 * architectures where sizeof(int)==4 (this makes indexing faster). 52 * 53 * Note that there are four free bits in the initial word for future 54 * extensions. 55 */ 56 struct filterent { 57 int f_proto; /* Protocol: getprotoby*() */ 58 unsigned f_action : 8; /* Filtering action: goto or A_... */ 59 unsigned f_srcop : 2; /* Source port operation: OP_... */ 60 unsigned f_dstop : 2; /* Destination port operation: OP_... */ 61 unsigned f_srctype : 3; /* T_ value of src */ 62 unsigned f_dsttype : 3; /* T_ value of dst */ 63 unsigned f_estab : 1; /* Check TCP ACK bit */ 64 unsigned f_syn : 1; /* Check TCP SYN bit */ 65 unsigned f_finrst : 1; /* Check TCP FIN/RST bits */ 66 unsigned f_invert : 1; /* true to complement match */ 67 struct ncprange f_src; /* Source address and mask */ 68 struct ncprange f_dst; /* Destination address and mask */ 69 u_short f_srcport; /* Source port, compared with f_srcop */ 70 u_short f_dstport; /* Destination port, compared with f_dstop */ 71 unsigned timeout; /* Keep alive value for passed packet */ 72 }; 73 74 #define MAXFILTERS 40 /* in each filter set */ 75 76 /* f_action values [0..MAXFILTERS) specify the next filter rule, others are: */ 77 #define A_NONE (MAXFILTERS) 78 #define A_PERMIT (A_NONE+1) 79 #define A_DENY (A_PERMIT+1) 80 81 struct filter { 82 struct filterent rule[MAXFILTERS]; /* incoming packet filter */ 83 const char *name; 84 unsigned fragok : 1; 85 unsigned logok : 1; 86 }; 87 88 /* Which filter set */ 89 #define FL_IN 0 90 #define FL_OUT 1 91 #define FL_DIAL 2 92 #define FL_KEEP 3 93 94 struct ipcp; 95 struct cmdargs; 96 97 extern int filter_Show(struct cmdargs const *); 98 extern int filter_Set(struct cmdargs const *); 99 extern const char * filter_Action2Nam(unsigned); 100 extern const char *filter_Op2Nam(unsigned); 101 extern void filter_AdjustAddr(struct filter *, struct ncpaddr *, 102 struct ncpaddr *, struct in_addr *); 103