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Diffstat (limited to 'src/filter.h')
| -rw-r--r-- | src/filter.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/filter.h b/src/filter.h new file mode 100644 index 0000000..e91d67f --- /dev/null +++ b/src/filter.h @@ -0,0 +1,101 @@ +/*- + * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> + * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> + * Internet Initiative Japan, Inc (IIJ) + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $FreeBSD: src/usr.sbin/ppp/filter.h,v 1.29.26.1 2010/12/21 17:10:29 kensmith Exp $ + */ + +/* Operations - f_srcop, f_dstop */ +#define OP_NONE 0 +#define OP_EQ 1 +#define OP_GT 2 +#define OP_LT 3 + +/* srctype or dsttype */ +#define T_ADDR 0 +#define T_MYADDR 1 +#define T_MYADDR6 2 +#define T_HISADDR 3 +#define T_HISADDR6 4 +#define T_DNS0 5 +#define T_DNS1 6 + +/* + * There's a struct filterent for each possible filter rule. The + * layout is designed to minimise size (there are 4 * MAXFILTERS of + * them) - which is also conveniently a power of 2 (32 bytes) on + * architectures where sizeof(int)==4 (this makes indexing faster). + * + * Note that there are four free bits in the initial word for future + * extensions. + */ +struct filterent { + int f_proto; /* Protocol: getprotoby*() */ + unsigned f_action : 8; /* Filtering action: goto or A_... */ + unsigned f_srcop : 2; /* Source port operation: OP_... */ + unsigned f_dstop : 2; /* Destination port operation: OP_... */ + unsigned f_srctype : 3; /* T_ value of src */ + unsigned f_dsttype : 3; /* T_ value of dst */ + unsigned f_estab : 1; /* Check TCP ACK bit */ + unsigned f_syn : 1; /* Check TCP SYN bit */ + unsigned f_finrst : 1; /* Check TCP FIN/RST bits */ + unsigned f_invert : 1; /* true to complement match */ + struct ncprange f_src; /* Source address and mask */ + struct ncprange f_dst; /* Destination address and mask */ + u_short f_srcport; /* Source port, compared with f_srcop */ + u_short f_dstport; /* Destination port, compared with f_dstop */ + unsigned timeout; /* Keep alive value for passed packet */ +}; + +#define MAXFILTERS 40 /* in each filter set */ + +/* f_action values [0..MAXFILTERS) specify the next filter rule, others are: */ +#define A_NONE (MAXFILTERS) +#define A_PERMIT (A_NONE+1) +#define A_DENY (A_PERMIT+1) + +struct filter { + struct filterent rule[MAXFILTERS]; /* incoming packet filter */ + const char *name; + unsigned fragok : 1; + unsigned logok : 1; +}; + +/* Which filter set */ +#define FL_IN 0 +#define FL_OUT 1 +#define FL_DIAL 2 +#define FL_KEEP 3 + +struct ipcp; +struct cmdargs; + +extern int filter_Show(struct cmdargs const *); +extern int filter_Set(struct cmdargs const *); +extern const char * filter_Action2Nam(unsigned); +extern const char *filter_Op2Nam(unsigned); +extern void filter_AdjustAddr(struct filter *, struct ncpaddr *, + struct ncpaddr *, struct in_addr *); |