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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;

#endif /* _KERNEL */

#endif /* _IP6_FW_H */