The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_fw.h

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    1 /*-
    2  * Copyright (c) 2002 Luigi Rizzo, Universita` di Pisa
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  *
   25  * $FreeBSD: releng/6.0/sys/netinet/ip_fw.h 149317 2005-08-20 08:36:57Z bz $
   26  */
   27 
   28 #ifndef _IPFW2_H
   29 #define _IPFW2_H
   30 
   31 /*
   32  * The kernel representation of ipfw rules is made of a list of
   33  * 'instructions' (for all practical purposes equivalent to BPF
   34  * instructions), which specify which fields of the packet
   35  * (or its metadata) should be analysed.
   36  *
   37  * Each instruction is stored in a structure which begins with
   38  * "ipfw_insn", and can contain extra fields depending on the
   39  * instruction type (listed below).
   40  * Note that the code is written so that individual instructions
   41  * have a size which is a multiple of 32 bits. This means that, if
   42  * such structures contain pointers or other 64-bit entities,
   43  * (there is just one instance now) they may end up unaligned on
   44  * 64-bit architectures, so the must be handled with care.
   45  *
   46  * "enum ipfw_opcodes" are the opcodes supported. We can have up
   47  * to 256 different opcodes. When adding new opcodes, they should
   48  * be appended to the end of the opcode list before O_LAST_OPCODE,
   49  * this will prevent the ABI from being broken, otherwise users
   50  * will have to recompile ipfw(8) when they update the kernel.
   51  */
   52 
   53 enum ipfw_opcodes {             /* arguments (4 byte each)      */
   54         O_NOP,
   55 
   56         O_IP_SRC,               /* u32 = IP                     */
   57         O_IP_SRC_MASK,          /* ip = IP/mask                 */
   58         O_IP_SRC_ME,            /* none                         */
   59         O_IP_SRC_SET,           /* u32=base, arg1=len, bitmap   */
   60 
   61         O_IP_DST,               /* u32 = IP                     */
   62         O_IP_DST_MASK,          /* ip = IP/mask                 */
   63         O_IP_DST_ME,            /* none                         */
   64         O_IP_DST_SET,           /* u32=base, arg1=len, bitmap   */
   65 
   66         O_IP_SRCPORT,           /* (n)port list:mask 4 byte ea  */
   67         O_IP_DSTPORT,           /* (n)port list:mask 4 byte ea  */
   68         O_PROTO,                /* arg1=protocol                */
   69 
   70         O_MACADDR2,             /* 2 mac addr:mask              */
   71         O_MAC_TYPE,             /* same as srcport              */
   72 
   73         O_LAYER2,               /* none                         */
   74         O_IN,                   /* none                         */
   75         O_FRAG,                 /* none                         */
   76 
   77         O_RECV,                 /* none                         */
   78         O_XMIT,                 /* none                         */
   79         O_VIA,                  /* none                         */
   80 
   81         O_IPOPT,                /* arg1 = 2*u8 bitmap           */
   82         O_IPLEN,                /* arg1 = len                   */
   83         O_IPID,                 /* arg1 = id                    */
   84 
   85         O_IPTOS,                /* arg1 = id                    */
   86         O_IPPRECEDENCE,         /* arg1 = precedence << 5       */
   87         O_IPTTL,                /* arg1 = TTL                   */
   88 
   89         O_IPVER,                /* arg1 = version               */
   90         O_UID,                  /* u32 = id                     */
   91         O_GID,                  /* u32 = id                     */
   92         O_ESTAB,                /* none (tcp established)       */
   93         O_TCPFLAGS,             /* arg1 = 2*u8 bitmap           */
   94         O_TCPWIN,               /* arg1 = desired win           */
   95         O_TCPSEQ,               /* u32 = desired seq.           */
   96         O_TCPACK,               /* u32 = desired seq.           */
   97         O_ICMPTYPE,             /* u32 = icmp bitmap            */
   98         O_TCPOPTS,              /* arg1 = 2*u8 bitmap           */
   99 
  100         O_VERREVPATH,           /* none                         */
  101         O_VERSRCREACH,          /* none                         */
  102 
  103         O_PROBE_STATE,          /* none                         */
  104         O_KEEP_STATE,           /* none                         */
  105         O_LIMIT,                /* ipfw_insn_limit              */
  106         O_LIMIT_PARENT,         /* dyn_type, not an opcode.     */
  107 
  108         /*
  109          * These are really 'actions'.
  110          */
  111 
  112         O_LOG,                  /* ipfw_insn_log                */
  113         O_PROB,                 /* u32 = match probability      */
  114 
  115         O_CHECK_STATE,          /* none                         */
  116         O_ACCEPT,               /* none                         */
  117         O_DENY,                 /* none                         */
  118         O_REJECT,               /* arg1=icmp arg (same as deny) */
  119         O_COUNT,                /* none                         */
  120         O_SKIPTO,               /* arg1=next rule number        */
  121         O_PIPE,                 /* arg1=pipe number             */
  122         O_QUEUE,                /* arg1=queue number            */
  123         O_DIVERT,               /* arg1=port number             */
  124         O_TEE,                  /* arg1=port number             */
  125         O_FORWARD_IP,           /* fwd sockaddr                 */
  126         O_FORWARD_MAC,          /* fwd mac                      */
  127 
  128         /*
  129          * More opcodes.
  130          */
  131         O_IPSEC,                /* has ipsec history            */
  132         O_IP_SRC_LOOKUP,        /* arg1=table number, u32=value */
  133         O_IP_DST_LOOKUP,        /* arg1=table number, u32=value */
  134         O_ANTISPOOF,            /* none                         */
  135         O_JAIL,                 /* u32 = id                     */
  136         O_ALTQ,                 /* u32 = altq classif. qid      */
  137         O_DIVERTED,             /* arg1=bitmap (1:loop, 2:out)  */
  138         O_TCPDATALEN,           /* arg1 = tcp data len          */
  139         O_IP6_SRC,              /* address without mask         */
  140         O_IP6_SRC_ME,           /* my addresses                 */
  141         O_IP6_SRC_MASK,         /* address with the mask        */
  142         O_IP6_DST,
  143         O_IP6_DST_ME,
  144         O_IP6_DST_MASK,
  145         O_FLOW6ID,              /* for flow id tag in the ipv6 pkt */
  146         O_ICMP6TYPE,            /* icmp6 packet type filtering  */
  147         O_EXT_HDR,              /* filtering for ipv6 extension header */
  148         O_IP6,
  149 
  150         /*
  151          * actions for ng_ipfw
  152          */
  153         O_NETGRAPH,             /* send to ng_ipfw              */
  154         O_NGTEE,                /* copy to ng_ipfw              */
  155 
  156         O_IP4,
  157 
  158         O_UNREACH6,             /* arg1=icmpv6 code arg (deny)  */
  159 
  160         O_LAST_OPCODE           /* not an opcode!               */
  161 };
  162 
  163 /*
  164  * The extension header are filtered only for presence using a bit
  165  * vector with a flag for each header.
  166  */
  167 #define EXT_FRAGMENT    0x1
  168 #define EXT_HOPOPTS     0x2
  169 #define EXT_ROUTING     0x4
  170 #define EXT_AH          0x8
  171 #define EXT_ESP         0x10
  172 #define EXT_DSTOPTS     0x20
  173 
  174 /*
  175  * Template for instructions.
  176  *
  177  * ipfw_insn is used for all instructions which require no operands,
  178  * a single 16-bit value (arg1), or a couple of 8-bit values.
  179  *
  180  * For other instructions which require different/larger arguments
  181  * we have derived structures, ipfw_insn_*.
  182  *
  183  * The size of the instruction (in 32-bit words) is in the low
  184  * 6 bits of "len". The 2 remaining bits are used to implement
  185  * NOT and OR on individual instructions. Given a type, you can
  186  * compute the length to be put in "len" using F_INSN_SIZE(t)
  187  *
  188  * F_NOT        negates the match result of the instruction.
  189  *
  190  * F_OR         is used to build or blocks. By default, instructions
  191  *              are evaluated as part of a logical AND. An "or" block
  192  *              { X or Y or Z } contains F_OR set in all but the last
  193  *              instruction of the block. A match will cause the code
  194  *              to skip past the last instruction of the block.
  195  *
  196  * NOTA BENE: in a couple of places we assume that
  197  *      sizeof(ipfw_insn) == sizeof(u_int32_t)
  198  * this needs to be fixed.
  199  *
  200  */
  201 typedef struct  _ipfw_insn {    /* template for instructions */
  202         enum ipfw_opcodes       opcode:8;
  203         u_int8_t        len;    /* numer of 32-byte words */
  204 #define F_NOT           0x80
  205 #define F_OR            0x40
  206 #define F_LEN_MASK      0x3f
  207 #define F_LEN(cmd)      ((cmd)->len & F_LEN_MASK)
  208 
  209         u_int16_t       arg1;
  210 } ipfw_insn;
  211 
  212 /*
  213  * The F_INSN_SIZE(type) computes the size, in 4-byte words, of
  214  * a given type.
  215  */
  216 #define F_INSN_SIZE(t)  ((sizeof (t))/sizeof(u_int32_t))
  217 
  218 /*
  219  * This is used to store an array of 16-bit entries (ports etc.)
  220  */
  221 typedef struct  _ipfw_insn_u16 {
  222         ipfw_insn o;
  223         u_int16_t ports[2];     /* there may be more */
  224 } ipfw_insn_u16;
  225 
  226 /*
  227  * This is used to store an array of 32-bit entries
  228  * (uid, single IPv4 addresses etc.)
  229  */
  230 typedef struct  _ipfw_insn_u32 {
  231         ipfw_insn o;
  232         u_int32_t d[1]; /* one or more */
  233 } ipfw_insn_u32;
  234 
  235 /*
  236  * This is used to store IP addr-mask pairs.
  237  */
  238 typedef struct  _ipfw_insn_ip {
  239         ipfw_insn o;
  240         struct in_addr  addr;
  241         struct in_addr  mask;
  242 } ipfw_insn_ip;
  243 
  244 /*
  245  * This is used to forward to a given address (ip).
  246  */
  247 typedef struct  _ipfw_insn_sa {
  248         ipfw_insn o;
  249         struct sockaddr_in sa;
  250 } ipfw_insn_sa;
  251 
  252 /*
  253  * This is used for MAC addr-mask pairs.
  254  */
  255 typedef struct  _ipfw_insn_mac {
  256         ipfw_insn o;
  257         u_char addr[12];        /* dst[6] + src[6] */
  258         u_char mask[12];        /* dst[6] + src[6] */
  259 } ipfw_insn_mac;
  260 
  261 /*
  262  * This is used for interface match rules (recv xx, xmit xx).
  263  */
  264 typedef struct  _ipfw_insn_if {
  265         ipfw_insn o;
  266         union {
  267                 struct in_addr ip;
  268                 int glob;
  269         } p;
  270         char name[IFNAMSIZ];
  271 } ipfw_insn_if;
  272 
  273 /*
  274  * This is used for pipe and queue actions, which need to store
  275  * a single pointer (which can have different size on different
  276  * architectures.
  277  * Note that, because of previous instructions, pipe_ptr might
  278  * be unaligned in the overall structure, so it needs to be
  279  * manipulated with care.
  280  */
  281 typedef struct  _ipfw_insn_pipe {
  282         ipfw_insn       o;
  283         void            *pipe_ptr;      /* XXX */
  284 } ipfw_insn_pipe;
  285 
  286 /*
  287  * This is used for storing an altq queue id number.
  288  */
  289 typedef struct _ipfw_insn_altq {
  290         ipfw_insn       o;
  291         u_int32_t       qid;
  292 } ipfw_insn_altq;
  293 
  294 /*
  295  * This is used for limit rules.
  296  */
  297 typedef struct  _ipfw_insn_limit {
  298         ipfw_insn o;
  299         u_int8_t _pad;
  300         u_int8_t limit_mask;    /* combination of DYN_* below   */
  301 #define DYN_SRC_ADDR    0x1
  302 #define DYN_SRC_PORT    0x2
  303 #define DYN_DST_ADDR    0x4
  304 #define DYN_DST_PORT    0x8
  305 
  306         u_int16_t conn_limit;
  307 } ipfw_insn_limit;
  308 
  309 /*
  310  * This is used for log instructions.
  311  */
  312 typedef struct  _ipfw_insn_log {
  313         ipfw_insn o;
  314         u_int32_t max_log;      /* how many do we log -- 0 = all */
  315         u_int32_t log_left;     /* how many left to log         */
  316 } ipfw_insn_log;
  317 
  318 /* Apply ipv6 mask on ipv6 addr */
  319 #define APPLY_MASK(addr,mask)                          \
  320     (addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \
  321     (addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \
  322     (addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \
  323     (addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3];
  324 
  325 /* Structure for ipv6 */
  326 typedef struct _ipfw_insn_ip6 {
  327        ipfw_insn o;
  328        struct in6_addr addr6;
  329        struct in6_addr mask6;
  330 } ipfw_insn_ip6;
  331 
  332 /* Used to support icmp6 types */
  333 typedef struct _ipfw_insn_icmp6 {
  334        ipfw_insn o;
  335        uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h
  336                        *     define ICMP6_MAXTYPE
  337                        *     as follows: n = ICMP6_MAXTYPE/32 + 1
  338                         *     Actually is 203 
  339                        */
  340 } ipfw_insn_icmp6;
  341 
  342 /*
  343  * Here we have the structure representing an ipfw rule.
  344  *
  345  * It starts with a general area (with link fields and counters)
  346  * followed by an array of one or more instructions, which the code
  347  * accesses as an array of 32-bit values.
  348  *
  349  * Given a rule pointer  r:
  350  *
  351  *  r->cmd              is the start of the first instruction.
  352  *  ACTION_PTR(r)       is the start of the first action (things to do
  353  *                      once a rule matched).
  354  *
  355  * When assembling instruction, remember the following:
  356  *
  357  *  + if a rule has a "keep-state" (or "limit") option, then the
  358  *      first instruction (at r->cmd) MUST BE an O_PROBE_STATE
  359  *  + if a rule has a "log" option, then the first action
  360  *      (at ACTION_PTR(r)) MUST be O_LOG
  361  *  + if a rule has an "altq" option, it comes after "log"
  362  *
  363  * NOTE: we use a simple linked list of rules because we never need
  364  *      to delete a rule without scanning the list. We do not use
  365  *      queue(3) macros for portability and readability.
  366  */
  367 
  368 struct ip_fw {
  369         struct ip_fw    *next;          /* linked list of rules         */
  370         struct ip_fw    *next_rule;     /* ptr to next [skipto] rule    */
  371         /* 'next_rule' is used to pass up 'set_disable' status          */
  372 
  373         u_int16_t       act_ofs;        /* offset of action in 32-bit units */
  374         u_int16_t       cmd_len;        /* # of 32-bit words in cmd     */
  375         u_int16_t       rulenum;        /* rule number                  */
  376         u_int8_t        set;            /* rule set (0..31)             */
  377 #define RESVD_SET       31      /* set for default and persistent rules */
  378         u_int8_t        _pad;           /* padding                      */
  379 
  380         /* These fields are present in all rules.                       */
  381         u_int64_t       pcnt;           /* Packet counter               */
  382         u_int64_t       bcnt;           /* Byte counter                 */
  383         u_int32_t       timestamp;      /* tv_sec of last match         */
  384 
  385         ipfw_insn       cmd[1];         /* storage for commands         */
  386 };
  387 
  388 #define ACTION_PTR(rule)                                \
  389         (ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) )
  390 
  391 #define RULESIZE(rule)  (sizeof(struct ip_fw) + \
  392         ((struct ip_fw *)(rule))->cmd_len * 4 - 4)
  393 
  394 /*
  395  * This structure is used as a flow mask and a flow id for various
  396  * parts of the code.
  397  */
  398 struct ipfw_flow_id {
  399         u_int32_t       dst_ip;
  400         u_int32_t       src_ip;
  401         u_int16_t       dst_port;
  402         u_int16_t       src_port;
  403         u_int8_t        proto;
  404         u_int8_t        flags;  /* protocol-specific flags */
  405         uint8_t         addr_type; /* 4 = ipv4, 6 = ipv6, 1=ether ? */
  406         struct in6_addr dst_ip6;        /* could also store MAC addr! */
  407         struct in6_addr src_ip6;
  408         u_int32_t       flow_id6;
  409         u_int32_t       frag_id6;
  410 };
  411 
  412 #define IS_IP6_FLOW_ID(id)      ((id)->addr_type == 6)
  413 
  414 /*
  415  * Dynamic ipfw rule.
  416  */
  417 typedef struct _ipfw_dyn_rule ipfw_dyn_rule;
  418 
  419 struct _ipfw_dyn_rule {
  420         ipfw_dyn_rule   *next;          /* linked list of rules.        */
  421         struct ip_fw *rule;             /* pointer to rule              */
  422         /* 'rule' is used to pass up the rule number (from the parent)  */
  423 
  424         ipfw_dyn_rule *parent;          /* pointer to parent rule       */
  425         u_int64_t       pcnt;           /* packet match counter         */
  426         u_int64_t       bcnt;           /* byte match counter           */
  427         struct ipfw_flow_id id;         /* (masked) flow id             */
  428         u_int32_t       expire;         /* expire time                  */
  429         u_int32_t       bucket;         /* which bucket in hash table   */
  430         u_int32_t       state;          /* state of this rule (typically a
  431                                          * combination of TCP flags)
  432                                          */
  433         u_int32_t       ack_fwd;        /* most recent ACKs in forward  */
  434         u_int32_t       ack_rev;        /* and reverse directions (used */
  435                                         /* to generate keepalives)      */
  436         u_int16_t       dyn_type;       /* rule type                    */
  437         u_int16_t       count;          /* refcount                     */
  438 };
  439 
  440 /*
  441  * Definitions for IP option names.
  442  */
  443 #define IP_FW_IPOPT_LSRR        0x01
  444 #define IP_FW_IPOPT_SSRR        0x02
  445 #define IP_FW_IPOPT_RR          0x04
  446 #define IP_FW_IPOPT_TS          0x08
  447 
  448 /*
  449  * Definitions for TCP option names.
  450  */
  451 #define IP_FW_TCPOPT_MSS        0x01
  452 #define IP_FW_TCPOPT_WINDOW     0x02
  453 #define IP_FW_TCPOPT_SACK       0x04
  454 #define IP_FW_TCPOPT_TS         0x08
  455 #define IP_FW_TCPOPT_CC         0x10
  456 
  457 #define ICMP_REJECT_RST         0x100   /* fake ICMP code (send a TCP RST) */
  458 #define ICMP6_UNREACH_RST       0x100   /* fake ICMPv6 code (send a TCP RST) */
  459 
  460 /*
  461  * These are used for lookup tables.
  462  */
  463 typedef struct  _ipfw_table_entry {
  464         in_addr_t       addr;           /* network address              */
  465         u_int32_t       value;          /* value                        */
  466         u_int16_t       tbl;            /* table number                 */
  467         u_int8_t        masklen;        /* mask length                  */
  468 } ipfw_table_entry;
  469 
  470 typedef struct  _ipfw_table {
  471         u_int32_t       size;           /* size of entries in bytes     */
  472         u_int32_t       cnt;            /* # of entries                 */
  473         u_int16_t       tbl;            /* table number                 */
  474         ipfw_table_entry ent[0];        /* entries                      */
  475 } ipfw_table;
  476 
  477 /*
  478  * Main firewall chains definitions and global var's definitions.
  479  */
  480 #ifdef _KERNEL
  481 
  482 /* Return values from ipfw_chk() */
  483 enum {
  484         IP_FW_PASS = 0,
  485         IP_FW_DENY,
  486         IP_FW_DIVERT,
  487         IP_FW_TEE,
  488         IP_FW_DUMMYNET,
  489         IP_FW_NETGRAPH,
  490         IP_FW_NGTEE,
  491 };
  492 
  493 /* flags for divert mtag */
  494 #define IP_FW_DIVERT_LOOPBACK_FLAG      0x00080000
  495 #define IP_FW_DIVERT_OUTPUT_FLAG        0x00100000
  496 
  497 /*
  498  * Structure for collecting parameters to dummynet for ip6_output forwarding
  499  */
  500 struct _ip6dn_args {
  501        struct ip6_pktopts *opt_or;
  502        struct route_in6 ro_or;
  503        int flags_or;
  504        struct ip6_moptions *im6o_or;
  505        struct ifnet *origifp_or;
  506        struct ifnet *ifp_or;
  507        struct sockaddr_in6 dst_or;
  508        u_long mtu_or;
  509        struct route_in6 ro_pmtu_or;
  510 };
  511 
  512 /*
  513  * Arguments for calling ipfw_chk() and dummynet_io(). We put them
  514  * all into a structure because this way it is easier and more
  515  * efficient to pass variables around and extend the interface.
  516  */
  517 struct ip_fw_args {
  518         struct mbuf     *m;             /* the mbuf chain               */
  519         struct ifnet    *oif;           /* output interface             */
  520         struct sockaddr_in *next_hop;   /* forward address              */
  521         struct ip_fw    *rule;          /* matching rule                */
  522         struct ether_header *eh;        /* for bridged packets          */
  523 
  524         int flags;                      /* for dummynet                 */
  525 
  526         struct ipfw_flow_id f_id;       /* grabbed from IP header       */
  527         u_int32_t       cookie;         /* a cookie depending on rule action */
  528         struct inpcb    *inp;
  529 
  530         struct _ip6dn_args      dummypar; /* dummynet->ip6_output */
  531 };
  532 
  533 /*
  534  * Function definitions.
  535  */
  536 
  537 /* Firewall hooks */
  538 struct sockopt;
  539 struct dn_flow_set;
  540 
  541 int ipfw_check_in(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp);
  542 int ipfw_check_out(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp);
  543 
  544 int ipfw_chk(struct ip_fw_args *);
  545 
  546 int ipfw_init(void);
  547 void ipfw_destroy(void);
  548 
  549 void flush_pipe_ptrs(struct dn_flow_set *match); /* used by dummynet */
  550 
  551 typedef int ip_fw_ctl_t(struct sockopt *);
  552 extern ip_fw_ctl_t *ip_fw_ctl_ptr;
  553 extern int fw_one_pass;
  554 extern int fw_enable;
  555 
  556 /* For kernel ipfw_ether and ipfw_bridge. */
  557 typedef int ip_fw_chk_t(struct ip_fw_args *args);
  558 extern  ip_fw_chk_t     *ip_fw_chk_ptr;
  559 #define IPFW_LOADED     (ip_fw_chk_ptr != NULL)
  560 
  561 #endif /* _KERNEL */
  562 #endif /* _IPFW2_H */

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