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/*!\file netinet6/ip6_fw.h |
* |
*/ |
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/* $FreeBSD: src/sys/netinet6/ip6_fw.h,v 1.12 2002/04/19 04:46:22 suz Exp $ */ |
/* $KAME: ip6_fw.h,v 1.9 2001/08/01 04:29:57 sumikawa Exp $ */ |
|
/* |
* Copyright (C) 1998, 1999, 2000 and 2001 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. |
*/ |
|
/* |
* Copyright (c) 1993 Daniel Boulet |
* Copyright (c) 1994 Ugen J.S.Antsilevich |
* |
* Redistribution and use in source forms, with and without modification, |
* are permitted provided that this entire comment appears intact. |
* |
* Redistribution in binary form may occur without any restrictions. |
* Obviously, it would be nice if you gave credit where credit is due |
* but requiring it would be too onerous. |
* |
* This software is provided ``AS IS'' without any warranties of any kind. |
* |
*/ |
|
#ifndef _IP6_FW_H |
#define _IP6_FW_H |
|
#include <net/if.h> |
|
/* |
* This union structure identifies an interface, either explicitly |
* by name or implicitly by IP address. The flags IP_FW_F_IIFNAME |
* and IP_FW_F_OIFNAME say how to interpret this structure. An |
* interface unit number of -1 matches any unit number, while an |
* IP address of 0.0.0.0 indicates matches any interface. |
* |
* The receive and transmit interfaces are only compared against the |
* the packet if the corresponding bit (IP_FW_F_IIFACE or IP_FW_F_OIFACE) |
* is set. Note some packets lack a receive or transmit interface |
* (in which case the missing "interface" never matches). |
*/ |
|
union ip6_fw_if { |
struct in6_addr fu_via_ip6; /* Specified by IPv6 address */ |
struct { /* Specified by interface name */ |
#define IP6FW_IFNLEN IFNAMSIZ |
char name[IP6FW_IFNLEN]; |
short unit; /* -1 means match any unit */ |
} fu_via_if; |
}; |
|
/* |
* Format of an IP firewall descriptor |
* |
* fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order. |
* fw_flg and fw_n*p are stored in host byte order (of course). |
* Port numbers are stored in HOST byte order. |
* Warning: setsockopt() will fail if sizeof(struct ip_fw) > MLEN (108) |
*/ |
|
struct ip6_fw { |
u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */ |
struct in6_addr fw_src, fw_dst; /* Source and destination IPv6 addr */ |
struct in6_addr fw_smsk, fw_dmsk; /* Mask for src and dest IPv6 addr */ |
u_short fw_number; /* Rule number */ |
u_short fw_flg; /* Flags word */ |
#define IPV6_FW_MAX_PORTS 10 /* A reasonable maximum */ |
u_int fw_ipflg; /* IP flags word */ |
u_short fw_pts[IPV6_FW_MAX_PORTS]; /* Array of port numbers to match */ |
u_char fw_ip6opt,fw_ip6nopt; /* IPv6 options set/unset */ |
u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */ |
#define IPV6_FW_ICMPTYPES_DIM (256 / (sizeof(unsigned) * 8)) |
unsigned fw_icmp6types[IPV6_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */ |
long timestamp; /* timestamp (tv_sec) of last match */ |
union ip6_fw_if fw_in_if, fw_out_if;/* Incoming and outgoing interfaces */ |
union { |
u_short fu_divert_port; /* Divert/tee port (options IP6DIVERT) */ |
u_short fu_skipto_rule; /* SKIPTO command rule number */ |
u_short fu_reject_code; /* REJECT response code */ |
} fw_un; |
u_char fw_prot; /* IPv6 protocol */ |
u_char fw_nports; /* N'of src ports and # of dst ports */ |
/* in ports array (dst ports follow */ |
/* src ports; max of 10 ports in all; */ |
/* count of 0 means match all ports) */ |
}; |
|
#define IPV6_FW_GETNSRCP(rule) ((rule)->fw_nports & 0x0f) |
#define IPV6_FW_SETNSRCP(rule, n) do { \ |
(rule)->fw_nports &= ~0x0f; \ |
(rule)->fw_nports |= (n); \ |
} while (0) |
#define IPV6_FW_GETNDSTP(rule) ((rule)->fw_nports >> 4) |
#define IPV6_FW_SETNDSTP(rule, n) do { \ |
(rule)->fw_nports &= ~0xf0; \ |
(rule)->fw_nports |= (n) << 4;\ |
} while (0) |
|
#define fw_divert_port fw_un.fu_divert_port |
#define fw_skipto_rule fw_un.fu_skipto_rule |
#define fw_reject_code fw_un.fu_reject_code |
|
struct ip6_fw_chain { |
LIST_ENTRY(ip6_fw_chain) chain; |
struct ip6_fw *rule; |
}; |
|
/* |
* Values for "flags" field . |
*/ |
#define IPV6_FW_F_IN 0x0001 /* Check inbound packets */ |
#define IPV6_FW_F_OUT 0x0002 /* Check outbound packets */ |
#define IPV6_FW_F_IIFACE 0x0004 /* Apply inbound interface test */ |
#define IPV6_FW_F_OIFACE 0x0008 /* Apply outbound interface test */ |
|
#define IPV6_FW_F_COMMAND 0x0070 /* Mask for type of chain entry: */ |
#define IPV6_FW_F_DENY 0x0000 /* This is a deny rule */ |
#define IPV6_FW_F_REJECT 0x0010 /* Deny and send a response packet */ |
#define IPV6_FW_F_ACCEPT 0x0020 /* This is an accept rule */ |
#define IPV6_FW_F_COUNT 0x0030 /* This is a count rule */ |
#define IPV6_FW_F_DIVERT 0x0040 /* This is a divert rule */ |
#define IPV6_FW_F_TEE 0x0050 /* This is a tee rule */ |
#define IPV6_FW_F_SKIPTO 0x0060 /* This is a skipto rule */ |
|
#define IPV6_FW_F_PRN 0x0080 /* Print if this rule matches */ |
|
#define IPV6_FW_F_SRNG 0x0100 /* The first two src ports are a min * |
* and max range (stored in host byte * |
* order). */ |
|
#define IPV6_FW_F_DRNG 0x0200 /* The first two dst ports are a min * |
* and max range (stored in host byte * |
* order). */ |
|
#define IPV6_FW_F_IIFNAME 0x0400 /* In interface by name/unit (not IP) */ |
#define IPV6_FW_F_OIFNAME 0x0800 /* Out interface by name/unit (not IP) */ |
|
#define IPV6_FW_F_INVSRC 0x1000 /* Invert sense of src check */ |
#define IPV6_FW_F_INVDST 0x2000 /* Invert sense of dst check */ |
|
#define IPV6_FW_F_FRAG 0x4000 /* Fragment */ |
|
#define IPV6_FW_F_ICMPBIT 0x8000 /* ICMP type bitmap is valid */ |
|
#define IPV6_FW_F_MASK 0xFFFF /* All possible flag bits mask */ |
|
/* |
* Flags for the 'fw_ipflg' field, for comparing values of ip and its protocols. */ |
#define IPV6_FW_IF_TCPEST 0x00000020 /* established TCP connection */ |
#define IPV6_FW_IF_TCPMSK 0x00000020 /* mask of all TCP values */ |
|
/* |
* For backwards compatibility with rules specifying "via iface" but |
* not restricted to only "in" or "out" packets, we define this combination |
* of bits to represent this configuration. |
*/ |
|
#define IF6_FW_F_VIAHACK (IPV6_FW_F_IN|IPV6_FW_F_OUT|IPV6_FW_F_IIFACE|IPV6_FW_F_OIFACE) |
|
/* |
* Definitions for REJECT response codes. |
* Values less than 256 correspond to ICMP unreachable codes. |
*/ |
#define IPV6_FW_REJECT_RST 0x0100 /* TCP packets: send RST */ |
|
/* |
* Definitions for IPv6 option names. |
*/ |
#define IPV6_FW_IP6OPT_HOPOPT 0x01 |
#define IPV6_FW_IP6OPT_ROUTE 0x02 |
#define IPV6_FW_IP6OPT_FRAG 0x04 |
#define IPV6_FW_IP6OPT_ESP 0x08 |
#define IPV6_FW_IP6OPT_AH 0x10 |
#define IPV6_FW_IP6OPT_NONXT 0x20 |
#define IPV6_FW_IP6OPT_OPTS 0x40 |
|
/* |
* Definitions for TCP flags. |
*/ |
#define IPV6_FW_TCPF_FIN TH_FIN |
#define IPV6_FW_TCPF_SYN TH_SYN |
#define IPV6_FW_TCPF_RST TH_RST |
#define IPV6_FW_TCPF_PSH TH_PUSH |
#define IPV6_FW_TCPF_ACK TH_ACK |
#define IPV6_FW_TCPF_URG TH_URG |
|
/* |
* Main firewall chains definitions and global var's definitions. |
*/ |
#ifdef _KERNEL |
|
/* |
* Function definitions. |
*/ |
void ip6_fw_init(void); |
|
/* Firewall hooks */ |
struct ip6_hdr; |
typedef int ip6_fw_chk_t __P((struct ip6_hdr**, struct ifnet*, |
u_short *, struct mbuf**)); |
typedef int ip6_fw_ctl_t __P((int, struct mbuf**)); |
extern ip6_fw_chk_t *ip6_fw_chk_ptr; |
extern ip6_fw_ctl_t *ip6_fw_ctl_ptr; |
extern int ip6_fw_enable; |
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#endif /* _KERNEL */ |
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#endif /* _IP6_FW_H */ |