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) 2002-2009 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/9.0/sys/netinet/ip_fw.h 225044 2011-08-20 17:05:11Z bz $
   26  */
   27 
   28 #ifndef _IPFW2_H
   29 #define _IPFW2_H
   30 
   31 /*
   32  * The default rule number.  By the design of ip_fw, the default rule
   33  * is the last one, so its number can also serve as the highest number
   34  * allowed for a rule.  The ip_fw code relies on both meanings of this
   35  * constant. 
   36  */
   37 #define IPFW_DEFAULT_RULE       65535
   38 
   39 /*
   40  * The number of ipfw tables.  The maximum allowed table number is the
   41  * (IPFW_TABLES_MAX - 1).
   42  */
   43 #define IPFW_TABLES_MAX         128
   44 
   45 /*
   46  * Most commands (queue, pipe, tag, untag, limit...) can have a 16-bit
   47  * argument between 1 and 65534. The value 0 is unused, the value
   48  * 65535 (IP_FW_TABLEARG) is used to represent 'tablearg', i.e. the
   49  * can be 1..65534, or 65535 to indicate the use of a 'tablearg'
   50  * result of the most recent table() lookup.
   51  * Note that 16bit is only a historical limit, resulting from
   52  * the use of a 16-bit fields for that value. In reality, we can have
   53  * 2^32 pipes, queues, tag values and so on, and use 0 as a tablearg.
   54  */
   55 #define IPFW_ARG_MIN            1
   56 #define IPFW_ARG_MAX            65534
   57 #define IP_FW_TABLEARG          65535   /* XXX should use 0 */
   58 
   59 /*
   60  * Number of entries in the call stack of the call/return commands.
   61  * Call stack currently is an uint16_t array with rule numbers.
   62  */
   63 #define IPFW_CALLSTACK_SIZE     16
   64 
   65 /*
   66  * The kernel representation of ipfw rules is made of a list of
   67  * 'instructions' (for all practical purposes equivalent to BPF
   68  * instructions), which specify which fields of the packet
   69  * (or its metadata) should be analysed.
   70  *
   71  * Each instruction is stored in a structure which begins with
   72  * "ipfw_insn", and can contain extra fields depending on the
   73  * instruction type (listed below).
   74  * Note that the code is written so that individual instructions
   75  * have a size which is a multiple of 32 bits. This means that, if
   76  * such structures contain pointers or other 64-bit entities,
   77  * (there is just one instance now) they may end up unaligned on
   78  * 64-bit architectures, so the must be handled with care.
   79  *
   80  * "enum ipfw_opcodes" are the opcodes supported. We can have up
   81  * to 256 different opcodes. When adding new opcodes, they should
   82  * be appended to the end of the opcode list before O_LAST_OPCODE,
   83  * this will prevent the ABI from being broken, otherwise users
   84  * will have to recompile ipfw(8) when they update the kernel.
   85  */
   86 
   87 enum ipfw_opcodes {             /* arguments (4 byte each)      */
   88         O_NOP,
   89 
   90         O_IP_SRC,               /* u32 = IP                     */
   91         O_IP_SRC_MASK,          /* ip = IP/mask                 */
   92         O_IP_SRC_ME,            /* none                         */
   93         O_IP_SRC_SET,           /* u32=base, arg1=len, bitmap   */
   94 
   95         O_IP_DST,               /* u32 = IP                     */
   96         O_IP_DST_MASK,          /* ip = IP/mask                 */
   97         O_IP_DST_ME,            /* none                         */
   98         O_IP_DST_SET,           /* u32=base, arg1=len, bitmap   */
   99 
  100         O_IP_SRCPORT,           /* (n)port list:mask 4 byte ea  */
  101         O_IP_DSTPORT,           /* (n)port list:mask 4 byte ea  */
  102         O_PROTO,                /* arg1=protocol                */
  103 
  104         O_MACADDR2,             /* 2 mac addr:mask              */
  105         O_MAC_TYPE,             /* same as srcport              */
  106 
  107         O_LAYER2,               /* none                         */
  108         O_IN,                   /* none                         */
  109         O_FRAG,                 /* none                         */
  110 
  111         O_RECV,                 /* none                         */
  112         O_XMIT,                 /* none                         */
  113         O_VIA,                  /* none                         */
  114 
  115         O_IPOPT,                /* arg1 = 2*u8 bitmap           */
  116         O_IPLEN,                /* arg1 = len                   */
  117         O_IPID,                 /* arg1 = id                    */
  118 
  119         O_IPTOS,                /* arg1 = id                    */
  120         O_IPPRECEDENCE,         /* arg1 = precedence << 5       */
  121         O_IPTTL,                /* arg1 = TTL                   */
  122 
  123         O_IPVER,                /* arg1 = version               */
  124         O_UID,                  /* u32 = id                     */
  125         O_GID,                  /* u32 = id                     */
  126         O_ESTAB,                /* none (tcp established)       */
  127         O_TCPFLAGS,             /* arg1 = 2*u8 bitmap           */
  128         O_TCPWIN,               /* arg1 = desired win           */
  129         O_TCPSEQ,               /* u32 = desired seq.           */
  130         O_TCPACK,               /* u32 = desired seq.           */
  131         O_ICMPTYPE,             /* u32 = icmp bitmap            */
  132         O_TCPOPTS,              /* arg1 = 2*u8 bitmap           */
  133 
  134         O_VERREVPATH,           /* none                         */
  135         O_VERSRCREACH,          /* none                         */
  136 
  137         O_PROBE_STATE,          /* none                         */
  138         O_KEEP_STATE,           /* none                         */
  139         O_LIMIT,                /* ipfw_insn_limit              */
  140         O_LIMIT_PARENT,         /* dyn_type, not an opcode.     */
  141 
  142         /*
  143          * These are really 'actions'.
  144          */
  145 
  146         O_LOG,                  /* ipfw_insn_log                */
  147         O_PROB,                 /* u32 = match probability      */
  148 
  149         O_CHECK_STATE,          /* none                         */
  150         O_ACCEPT,               /* none                         */
  151         O_DENY,                 /* none                         */
  152         O_REJECT,               /* arg1=icmp arg (same as deny) */
  153         O_COUNT,                /* none                         */
  154         O_SKIPTO,               /* arg1=next rule number        */
  155         O_PIPE,                 /* arg1=pipe number             */
  156         O_QUEUE,                /* arg1=queue number            */
  157         O_DIVERT,               /* arg1=port number             */
  158         O_TEE,                  /* arg1=port number             */
  159         O_FORWARD_IP,           /* fwd sockaddr                 */
  160         O_FORWARD_MAC,          /* fwd mac                      */
  161         O_NAT,                  /* nope                         */
  162         O_REASS,                /* none                         */
  163         
  164         /*
  165          * More opcodes.
  166          */
  167         O_IPSEC,                /* has ipsec history            */
  168         O_IP_SRC_LOOKUP,        /* arg1=table number, u32=value */
  169         O_IP_DST_LOOKUP,        /* arg1=table number, u32=value */
  170         O_ANTISPOOF,            /* none                         */
  171         O_JAIL,                 /* u32 = id                     */
  172         O_ALTQ,                 /* u32 = altq classif. qid      */
  173         O_DIVERTED,             /* arg1=bitmap (1:loop, 2:out)  */
  174         O_TCPDATALEN,           /* arg1 = tcp data len          */
  175         O_IP6_SRC,              /* address without mask         */
  176         O_IP6_SRC_ME,           /* my addresses                 */
  177         O_IP6_SRC_MASK,         /* address with the mask        */
  178         O_IP6_DST,
  179         O_IP6_DST_ME,
  180         O_IP6_DST_MASK,
  181         O_FLOW6ID,              /* for flow id tag in the ipv6 pkt */
  182         O_ICMP6TYPE,            /* icmp6 packet type filtering  */
  183         O_EXT_HDR,              /* filtering for ipv6 extension header */
  184         O_IP6,
  185 
  186         /*
  187          * actions for ng_ipfw
  188          */
  189         O_NETGRAPH,             /* send to ng_ipfw              */
  190         O_NGTEE,                /* copy to ng_ipfw              */
  191 
  192         O_IP4,
  193 
  194         O_UNREACH6,             /* arg1=icmpv6 code arg (deny)  */
  195 
  196         O_TAG,                  /* arg1=tag number */
  197         O_TAGGED,               /* arg1=tag number */
  198 
  199         O_SETFIB,               /* arg1=FIB number */
  200         O_FIB,                  /* arg1=FIB desired fib number */
  201         
  202         O_SOCKARG,              /* socket argument */
  203 
  204         O_CALLRETURN,           /* arg1=called rule number */
  205 
  206         O_FORWARD_IP6,          /* fwd sockaddr_in6             */
  207 
  208         O_LAST_OPCODE           /* not an opcode!               */
  209 };
  210 
  211 
  212 /*
  213  * The extension header are filtered only for presence using a bit
  214  * vector with a flag for each header.
  215  */
  216 #define EXT_FRAGMENT    0x1
  217 #define EXT_HOPOPTS     0x2
  218 #define EXT_ROUTING     0x4
  219 #define EXT_AH          0x8
  220 #define EXT_ESP         0x10
  221 #define EXT_DSTOPTS     0x20
  222 #define EXT_RTHDR0              0x40
  223 #define EXT_RTHDR2              0x80
  224 
  225 /*
  226  * Template for instructions.
  227  *
  228  * ipfw_insn is used for all instructions which require no operands,
  229  * a single 16-bit value (arg1), or a couple of 8-bit values.
  230  *
  231  * For other instructions which require different/larger arguments
  232  * we have derived structures, ipfw_insn_*.
  233  *
  234  * The size of the instruction (in 32-bit words) is in the low
  235  * 6 bits of "len". The 2 remaining bits are used to implement
  236  * NOT and OR on individual instructions. Given a type, you can
  237  * compute the length to be put in "len" using F_INSN_SIZE(t)
  238  *
  239  * F_NOT        negates the match result of the instruction.
  240  *
  241  * F_OR         is used to build or blocks. By default, instructions
  242  *              are evaluated as part of a logical AND. An "or" block
  243  *              { X or Y or Z } contains F_OR set in all but the last
  244  *              instruction of the block. A match will cause the code
  245  *              to skip past the last instruction of the block.
  246  *
  247  * NOTA BENE: in a couple of places we assume that
  248  *      sizeof(ipfw_insn) == sizeof(u_int32_t)
  249  * this needs to be fixed.
  250  *
  251  */
  252 typedef struct  _ipfw_insn {    /* template for instructions */
  253         u_int8_t        opcode;
  254         u_int8_t        len;    /* number of 32-bit words */
  255 #define F_NOT           0x80
  256 #define F_OR            0x40
  257 #define F_LEN_MASK      0x3f
  258 #define F_LEN(cmd)      ((cmd)->len & F_LEN_MASK)
  259 
  260         u_int16_t       arg1;
  261 } ipfw_insn;
  262 
  263 /*
  264  * The F_INSN_SIZE(type) computes the size, in 4-byte words, of
  265  * a given type.
  266  */
  267 #define F_INSN_SIZE(t)  ((sizeof (t))/sizeof(u_int32_t))
  268 
  269 /*
  270  * This is used to store an array of 16-bit entries (ports etc.)
  271  */
  272 typedef struct  _ipfw_insn_u16 {
  273         ipfw_insn o;
  274         u_int16_t ports[2];     /* there may be more */
  275 } ipfw_insn_u16;
  276 
  277 /*
  278  * This is used to store an array of 32-bit entries
  279  * (uid, single IPv4 addresses etc.)
  280  */
  281 typedef struct  _ipfw_insn_u32 {
  282         ipfw_insn o;
  283         u_int32_t d[1]; /* one or more */
  284 } ipfw_insn_u32;
  285 
  286 /*
  287  * This is used to store IP addr-mask pairs.
  288  */
  289 typedef struct  _ipfw_insn_ip {
  290         ipfw_insn o;
  291         struct in_addr  addr;
  292         struct in_addr  mask;
  293 } ipfw_insn_ip;
  294 
  295 /*
  296  * This is used to forward to a given address (ip).
  297  */
  298 typedef struct  _ipfw_insn_sa {
  299         ipfw_insn o;
  300         struct sockaddr_in sa;
  301 } ipfw_insn_sa;
  302 
  303 /*
  304  * This is used to forward to a given address (ipv6).
  305  */
  306 typedef struct _ipfw_insn_sa6 {
  307         ipfw_insn o;
  308         struct sockaddr_in6 sa;
  309 } ipfw_insn_sa6;
  310 
  311 /*
  312  * This is used for MAC addr-mask pairs.
  313  */
  314 typedef struct  _ipfw_insn_mac {
  315         ipfw_insn o;
  316         u_char addr[12];        /* dst[6] + src[6] */
  317         u_char mask[12];        /* dst[6] + src[6] */
  318 } ipfw_insn_mac;
  319 
  320 /*
  321  * This is used for interface match rules (recv xx, xmit xx).
  322  */
  323 typedef struct  _ipfw_insn_if {
  324         ipfw_insn o;
  325         union {
  326                 struct in_addr ip;
  327                 int glob;
  328         } p;
  329         char name[IFNAMSIZ];
  330 } ipfw_insn_if;
  331 
  332 /*
  333  * This is used for storing an altq queue id number.
  334  */
  335 typedef struct _ipfw_insn_altq {
  336         ipfw_insn       o;
  337         u_int32_t       qid;
  338 } ipfw_insn_altq;
  339 
  340 /*
  341  * This is used for limit rules.
  342  */
  343 typedef struct  _ipfw_insn_limit {
  344         ipfw_insn o;
  345         u_int8_t _pad;
  346         u_int8_t limit_mask;    /* combination of DYN_* below   */
  347 #define DYN_SRC_ADDR    0x1
  348 #define DYN_SRC_PORT    0x2
  349 #define DYN_DST_ADDR    0x4
  350 #define DYN_DST_PORT    0x8
  351 
  352         u_int16_t conn_limit;
  353 } ipfw_insn_limit;
  354 
  355 /*
  356  * This is used for log instructions.
  357  */
  358 typedef struct  _ipfw_insn_log {
  359         ipfw_insn o;
  360         u_int32_t max_log;      /* how many do we log -- 0 = all */
  361         u_int32_t log_left;     /* how many left to log         */
  362 } ipfw_insn_log;
  363 
  364 /*
  365  * Data structures required by both ipfw(8) and ipfw(4) but not part of the
  366  * management API are protected by IPFW_INTERNAL.
  367  */
  368 #ifdef IPFW_INTERNAL
  369 /* Server pool support (LSNAT). */
  370 struct cfg_spool {
  371         LIST_ENTRY(cfg_spool)   _next;          /* chain of spool instances */
  372         struct in_addr          addr;
  373         u_short                 port;
  374 };
  375 #endif
  376 
  377 /* Redirect modes id. */
  378 #define REDIR_ADDR      0x01
  379 #define REDIR_PORT      0x02
  380 #define REDIR_PROTO     0x04
  381 
  382 #ifdef IPFW_INTERNAL
  383 /* Nat redirect configuration. */
  384 struct cfg_redir {
  385         LIST_ENTRY(cfg_redir)   _next;          /* chain of redir instances */
  386         u_int16_t               mode;           /* type of redirect mode */
  387         struct in_addr          laddr;          /* local ip address */
  388         struct in_addr          paddr;          /* public ip address */
  389         struct in_addr          raddr;          /* remote ip address */
  390         u_short                 lport;          /* local port */
  391         u_short                 pport;          /* public port */
  392         u_short                 rport;          /* remote port  */
  393         u_short                 pport_cnt;      /* number of public ports */
  394         u_short                 rport_cnt;      /* number of remote ports */
  395         int                     proto;          /* protocol: tcp/udp */
  396         struct alias_link       **alink;        
  397         /* num of entry in spool chain */
  398         u_int16_t               spool_cnt;      
  399         /* chain of spool instances */
  400         LIST_HEAD(spool_chain, cfg_spool) spool_chain;
  401 };
  402 #endif
  403 
  404 #ifdef IPFW_INTERNAL
  405 /* Nat configuration data struct. */
  406 struct cfg_nat {
  407         /* chain of nat instances */
  408         LIST_ENTRY(cfg_nat)     _next;
  409         int                     id;                     /* nat id */
  410         struct in_addr          ip;                     /* nat ip address */
  411         char                    if_name[IF_NAMESIZE];   /* interface name */
  412         int                     mode;                   /* aliasing mode */
  413         struct libalias         *lib;                   /* libalias instance */
  414         /* number of entry in spool chain */
  415         int                     redir_cnt;              
  416         /* chain of redir instances */
  417         LIST_HEAD(redir_chain, cfg_redir) redir_chain;  
  418 };
  419 #endif
  420 
  421 #define SOF_NAT         sizeof(struct cfg_nat)
  422 #define SOF_REDIR       sizeof(struct cfg_redir)
  423 #define SOF_SPOOL       sizeof(struct cfg_spool)
  424 
  425 /* Nat command. */
  426 typedef struct  _ipfw_insn_nat {
  427         ipfw_insn       o;
  428         struct cfg_nat *nat;    
  429 } ipfw_insn_nat;
  430 
  431 /* Apply ipv6 mask on ipv6 addr */
  432 #define APPLY_MASK(addr,mask)                          \
  433     (addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \
  434     (addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \
  435     (addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \
  436     (addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3];
  437 
  438 /* Structure for ipv6 */
  439 typedef struct _ipfw_insn_ip6 {
  440        ipfw_insn o;
  441        struct in6_addr addr6;
  442        struct in6_addr mask6;
  443 } ipfw_insn_ip6;
  444 
  445 /* Used to support icmp6 types */
  446 typedef struct _ipfw_insn_icmp6 {
  447        ipfw_insn o;
  448        uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h
  449                        *     define ICMP6_MAXTYPE
  450                        *     as follows: n = ICMP6_MAXTYPE/32 + 1
  451                         *     Actually is 203 
  452                        */
  453 } ipfw_insn_icmp6;
  454 
  455 /*
  456  * Here we have the structure representing an ipfw rule.
  457  *
  458  * It starts with a general area (with link fields and counters)
  459  * followed by an array of one or more instructions, which the code
  460  * accesses as an array of 32-bit values.
  461  *
  462  * Given a rule pointer  r:
  463  *
  464  *  r->cmd              is the start of the first instruction.
  465  *  ACTION_PTR(r)       is the start of the first action (things to do
  466  *                      once a rule matched).
  467  *
  468  * When assembling instruction, remember the following:
  469  *
  470  *  + if a rule has a "keep-state" (or "limit") option, then the
  471  *      first instruction (at r->cmd) MUST BE an O_PROBE_STATE
  472  *  + if a rule has a "log" option, then the first action
  473  *      (at ACTION_PTR(r)) MUST be O_LOG
  474  *  + if a rule has an "altq" option, it comes after "log"
  475  *  + if a rule has an O_TAG option, it comes after "log" and "altq"
  476  *
  477  * NOTE: we use a simple linked list of rules because we never need
  478  *      to delete a rule without scanning the list. We do not use
  479  *      queue(3) macros for portability and readability.
  480  */
  481 
  482 struct ip_fw {
  483         struct ip_fw    *x_next;        /* linked list of rules         */
  484         struct ip_fw    *next_rule;     /* ptr to next [skipto] rule    */
  485         /* 'next_rule' is used to pass up 'set_disable' status          */
  486 
  487         uint16_t        act_ofs;        /* offset of action in 32-bit units */
  488         uint16_t        cmd_len;        /* # of 32-bit words in cmd     */
  489         uint16_t        rulenum;        /* rule number                  */
  490         uint8_t set;            /* rule set (0..31)             */
  491 #define RESVD_SET       31      /* set for default and persistent rules */
  492         uint8_t         _pad;           /* padding                      */
  493         uint32_t        id;             /* rule id */
  494 
  495         /* These fields are present in all rules.                       */
  496         uint64_t        pcnt;           /* Packet counter               */
  497         uint64_t        bcnt;           /* Byte counter                 */
  498         uint32_t        timestamp;      /* tv_sec of last match         */
  499 
  500         ipfw_insn       cmd[1];         /* storage for commands         */
  501 };
  502 
  503 #define ACTION_PTR(rule)                                \
  504         (ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) )
  505 
  506 #define RULESIZE(rule)  (sizeof(struct ip_fw) + \
  507         ((struct ip_fw *)(rule))->cmd_len * 4 - 4)
  508 
  509 #if 1 // should be moved to in.h
  510 /*
  511  * This structure is used as a flow mask and a flow id for various
  512  * parts of the code.
  513  * addr_type is used in userland and kernel to mark the address type.
  514  * fib is used in the kernel to record the fib in use.
  515  * _flags is used in the kernel to store tcp flags for dynamic rules.
  516  */
  517 struct ipfw_flow_id {
  518         uint32_t        dst_ip;
  519         uint32_t        src_ip;
  520         uint16_t        dst_port;
  521         uint16_t        src_port;
  522         uint8_t         fib;
  523         uint8_t         proto;
  524         uint8_t         _flags; /* protocol-specific flags */
  525         uint8_t         addr_type; /* 4=ip4, 6=ip6, 1=ether ? */
  526         struct in6_addr dst_ip6;
  527         struct in6_addr src_ip6;
  528         uint32_t        flow_id6;
  529         uint32_t        extra; /* queue/pipe or frag_id */
  530 };
  531 #endif
  532 
  533 #define IS_IP6_FLOW_ID(id)      ((id)->addr_type == 6)
  534 
  535 /*
  536  * Dynamic ipfw rule.
  537  */
  538 typedef struct _ipfw_dyn_rule ipfw_dyn_rule;
  539 
  540 struct _ipfw_dyn_rule {
  541         ipfw_dyn_rule   *next;          /* linked list of rules.        */
  542         struct ip_fw *rule;             /* pointer to rule              */
  543         /* 'rule' is used to pass up the rule number (from the parent)  */
  544 
  545         ipfw_dyn_rule *parent;          /* pointer to parent rule       */
  546         u_int64_t       pcnt;           /* packet match counter         */
  547         u_int64_t       bcnt;           /* byte match counter           */
  548         struct ipfw_flow_id id;         /* (masked) flow id             */
  549         u_int32_t       expire;         /* expire time                  */
  550         u_int32_t       bucket;         /* which bucket in hash table   */
  551         u_int32_t       state;          /* state of this rule (typically a
  552                                          * combination of TCP flags)
  553                                          */
  554         u_int32_t       ack_fwd;        /* most recent ACKs in forward  */
  555         u_int32_t       ack_rev;        /* and reverse directions (used */
  556                                         /* to generate keepalives)      */
  557         u_int16_t       dyn_type;       /* rule type                    */
  558         u_int16_t       count;          /* refcount                     */
  559 };
  560 
  561 /*
  562  * Definitions for IP option names.
  563  */
  564 #define IP_FW_IPOPT_LSRR        0x01
  565 #define IP_FW_IPOPT_SSRR        0x02
  566 #define IP_FW_IPOPT_RR          0x04
  567 #define IP_FW_IPOPT_TS          0x08
  568 
  569 /*
  570  * Definitions for TCP option names.
  571  */
  572 #define IP_FW_TCPOPT_MSS        0x01
  573 #define IP_FW_TCPOPT_WINDOW     0x02
  574 #define IP_FW_TCPOPT_SACK       0x04
  575 #define IP_FW_TCPOPT_TS         0x08
  576 #define IP_FW_TCPOPT_CC         0x10
  577 
  578 #define ICMP_REJECT_RST         0x100   /* fake ICMP code (send a TCP RST) */
  579 #define ICMP6_UNREACH_RST       0x100   /* fake ICMPv6 code (send a TCP RST) */
  580 
  581 /*
  582  * These are used for lookup tables.
  583  */
  584 typedef struct  _ipfw_table_entry {
  585         in_addr_t       addr;           /* network address              */
  586         u_int32_t       value;          /* value                        */
  587         u_int16_t       tbl;            /* table number                 */
  588         u_int8_t        masklen;        /* mask length                  */
  589 } ipfw_table_entry;
  590 
  591 typedef struct  _ipfw_table {
  592         u_int32_t       size;           /* size of entries in bytes     */
  593         u_int32_t       cnt;            /* # of entries                 */
  594         u_int16_t       tbl;            /* table number                 */
  595         ipfw_table_entry ent[0];        /* entries                      */
  596 } ipfw_table;
  597 
  598 #endif /* _IPFW2_H */

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