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/7.4/sys/netinet/ip_fw.h 200123 2009-12-05 13:53:41Z luigi $
   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 kernel representation of ipfw rules is made of a list of
   41  * 'instructions' (for all practical purposes equivalent to BPF
   42  * instructions), which specify which fields of the packet
   43  * (or its metadata) should be analysed.
   44  *
   45  * Each instruction is stored in a structure which begins with
   46  * "ipfw_insn", and can contain extra fields depending on the
   47  * instruction type (listed below).
   48  * Note that the code is written so that individual instructions
   49  * have a size which is a multiple of 32 bits. This means that, if
   50  * such structures contain pointers or other 64-bit entities,
   51  * (there is just one instance now) they may end up unaligned on
   52  * 64-bit architectures, so the must be handled with care.
   53  *
   54  * "enum ipfw_opcodes" are the opcodes supported. We can have up
   55  * to 256 different opcodes. When adding new opcodes, they should
   56  * be appended to the end of the opcode list before O_LAST_OPCODE,
   57  * this will prevent the ABI from being broken, otherwise users
   58  * will have to recompile ipfw(8) when they update the kernel.
   59  */
   60 
   61 enum ipfw_opcodes {             /* arguments (4 byte each)      */
   62         O_NOP,
   63 
   64         O_IP_SRC,               /* u32 = IP                     */
   65         O_IP_SRC_MASK,          /* ip = IP/mask                 */
   66         O_IP_SRC_ME,            /* none                         */
   67         O_IP_SRC_SET,           /* u32=base, arg1=len, bitmap   */
   68 
   69         O_IP_DST,               /* u32 = IP                     */
   70         O_IP_DST_MASK,          /* ip = IP/mask                 */
   71         O_IP_DST_ME,            /* none                         */
   72         O_IP_DST_SET,           /* u32=base, arg1=len, bitmap   */
   73 
   74         O_IP_SRCPORT,           /* (n)port list:mask 4 byte ea  */
   75         O_IP_DSTPORT,           /* (n)port list:mask 4 byte ea  */
   76         O_PROTO,                /* arg1=protocol                */
   77 
   78         O_MACADDR2,             /* 2 mac addr:mask              */
   79         O_MAC_TYPE,             /* same as srcport              */
   80 
   81         O_LAYER2,               /* none                         */
   82         O_IN,                   /* none                         */
   83         O_FRAG,                 /* none                         */
   84 
   85         O_RECV,                 /* none                         */
   86         O_XMIT,                 /* none                         */
   87         O_VIA,                  /* none                         */
   88 
   89         O_IPOPT,                /* arg1 = 2*u8 bitmap           */
   90         O_IPLEN,                /* arg1 = len                   */
   91         O_IPID,                 /* arg1 = id                    */
   92 
   93         O_IPTOS,                /* arg1 = id                    */
   94         O_IPPRECEDENCE,         /* arg1 = precedence << 5       */
   95         O_IPTTL,                /* arg1 = TTL                   */
   96 
   97         O_IPVER,                /* arg1 = version               */
   98         O_UID,                  /* u32 = id                     */
   99         O_GID,                  /* u32 = id                     */
  100         O_ESTAB,                /* none (tcp established)       */
  101         O_TCPFLAGS,             /* arg1 = 2*u8 bitmap           */
  102         O_TCPWIN,               /* arg1 = desired win           */
  103         O_TCPSEQ,               /* u32 = desired seq.           */
  104         O_TCPACK,               /* u32 = desired seq.           */
  105         O_ICMPTYPE,             /* u32 = icmp bitmap            */
  106         O_TCPOPTS,              /* arg1 = 2*u8 bitmap           */
  107 
  108         O_VERREVPATH,           /* none                         */
  109         O_VERSRCREACH,          /* none                         */
  110 
  111         O_PROBE_STATE,          /* none                         */
  112         O_KEEP_STATE,           /* none                         */
  113         O_LIMIT,                /* ipfw_insn_limit              */
  114         O_LIMIT_PARENT,         /* dyn_type, not an opcode.     */
  115 
  116         /*
  117          * These are really 'actions'.
  118          */
  119 
  120         O_LOG,                  /* ipfw_insn_log                */
  121         O_PROB,                 /* u32 = match probability      */
  122 
  123         O_CHECK_STATE,          /* none                         */
  124         O_ACCEPT,               /* none                         */
  125         O_DENY,                 /* none                         */
  126         O_REJECT,               /* arg1=icmp arg (same as deny) */
  127         O_COUNT,                /* none                         */
  128         O_SKIPTO,               /* arg1=next rule number        */
  129         O_PIPE,                 /* arg1=pipe number             */
  130         O_QUEUE,                /* arg1=queue number            */
  131         O_DIVERT,               /* arg1=port number             */
  132         O_TEE,                  /* arg1=port number             */
  133         O_FORWARD_IP,           /* fwd sockaddr                 */
  134         O_FORWARD_MAC,          /* fwd mac                      */
  135         O_NAT,                  /* nope                         */
  136 
  137         /*
  138          * More opcodes.
  139          */
  140         O_IPSEC,                /* has ipsec history            */
  141         O_IP_SRC_LOOKUP,        /* arg1=table number, u32=value */
  142         O_IP_DST_LOOKUP,        /* arg1=table number, u32=value */
  143         O_ANTISPOOF,            /* none                         */
  144         O_JAIL,                 /* u32 = id                     */
  145         O_ALTQ,                 /* u32 = altq classif. qid      */
  146         O_DIVERTED,             /* arg1=bitmap (1:loop, 2:out)  */
  147         O_TCPDATALEN,           /* arg1 = tcp data len          */
  148         O_IP6_SRC,              /* address without mask         */
  149         O_IP6_SRC_ME,           /* my addresses                 */
  150         O_IP6_SRC_MASK,         /* address with the mask        */
  151         O_IP6_DST,
  152         O_IP6_DST_ME,
  153         O_IP6_DST_MASK,
  154         O_FLOW6ID,              /* for flow id tag in the ipv6 pkt */
  155         O_ICMP6TYPE,            /* icmp6 packet type filtering  */
  156         O_EXT_HDR,              /* filtering for ipv6 extension header */
  157         O_IP6,
  158 
  159         /*
  160          * actions for ng_ipfw
  161          */
  162         O_NETGRAPH,             /* send to ng_ipfw              */
  163         O_NGTEE,                /* copy to ng_ipfw              */
  164 
  165         O_IP4,
  166 
  167         O_UNREACH6,             /* arg1=icmpv6 code arg (deny)  */
  168 
  169         O_TAG,                  /* arg1=tag number */
  170         O_TAGGED,               /* arg1=tag number */
  171 
  172         O_SETFIB,               /* arg1=FIB number */
  173         O_FIB,                  /* arg1=FIB desired fib number */
  174 
  175         O_LAST_OPCODE           /* not an opcode!               */
  176 };
  177 
  178 /*
  179  * The extension header are filtered only for presence using a bit
  180  * vector with a flag for each header.
  181  */
  182 #define EXT_FRAGMENT    0x1
  183 #define EXT_HOPOPTS     0x2
  184 #define EXT_ROUTING     0x4
  185 #define EXT_AH          0x8
  186 #define EXT_ESP         0x10
  187 #define EXT_DSTOPTS     0x20
  188 #define EXT_RTHDR0              0x40
  189 #define EXT_RTHDR2              0x80
  190 
  191 /*
  192  * Template for instructions.
  193  *
  194  * ipfw_insn is used for all instructions which require no operands,
  195  * a single 16-bit value (arg1), or a couple of 8-bit values.
  196  *
  197  * For other instructions which require different/larger arguments
  198  * we have derived structures, ipfw_insn_*.
  199  *
  200  * The size of the instruction (in 32-bit words) is in the low
  201  * 6 bits of "len". The 2 remaining bits are used to implement
  202  * NOT and OR on individual instructions. Given a type, you can
  203  * compute the length to be put in "len" using F_INSN_SIZE(t)
  204  *
  205  * F_NOT        negates the match result of the instruction.
  206  *
  207  * F_OR         is used to build or blocks. By default, instructions
  208  *              are evaluated as part of a logical AND. An "or" block
  209  *              { X or Y or Z } contains F_OR set in all but the last
  210  *              instruction of the block. A match will cause the code
  211  *              to skip past the last instruction of the block.
  212  *
  213  * NOTA BENE: in a couple of places we assume that
  214  *      sizeof(ipfw_insn) == sizeof(u_int32_t)
  215  * this needs to be fixed.
  216  *
  217  */
  218 typedef struct  _ipfw_insn {    /* template for instructions */
  219         u_int8_t        opcode;
  220         u_int8_t        len;    /* number of 32-bit words */
  221 #define F_NOT           0x80
  222 #define F_OR            0x40
  223 #define F_LEN_MASK      0x3f
  224 #define F_LEN(cmd)      ((cmd)->len & F_LEN_MASK)
  225 
  226         u_int16_t       arg1;
  227 } ipfw_insn;
  228 
  229 /*
  230  * The F_INSN_SIZE(type) computes the size, in 4-byte words, of
  231  * a given type.
  232  */
  233 #define F_INSN_SIZE(t)  ((sizeof (t))/sizeof(u_int32_t))
  234 
  235 #define MTAG_IPFW       1148380143      /* IPFW-tagged cookie */
  236 
  237 /*
  238  * This is used to store an array of 16-bit entries (ports etc.)
  239  */
  240 typedef struct  _ipfw_insn_u16 {
  241         ipfw_insn o;
  242         u_int16_t ports[2];     /* there may be more */
  243 } ipfw_insn_u16;
  244 
  245 /*
  246  * This is used to store an array of 32-bit entries
  247  * (uid, single IPv4 addresses etc.)
  248  */
  249 typedef struct  _ipfw_insn_u32 {
  250         ipfw_insn o;
  251         u_int32_t d[1]; /* one or more */
  252 } ipfw_insn_u32;
  253 
  254 /*
  255  * This is used to store IP addr-mask pairs.
  256  */
  257 typedef struct  _ipfw_insn_ip {
  258         ipfw_insn o;
  259         struct in_addr  addr;
  260         struct in_addr  mask;
  261 } ipfw_insn_ip;
  262 
  263 /*
  264  * This is used to forward to a given address (ip).
  265  */
  266 typedef struct  _ipfw_insn_sa {
  267         ipfw_insn o;
  268         struct sockaddr_in sa;
  269 } ipfw_insn_sa;
  270 
  271 /*
  272  * This is used for MAC addr-mask pairs.
  273  */
  274 typedef struct  _ipfw_insn_mac {
  275         ipfw_insn o;
  276         u_char addr[12];        /* dst[6] + src[6] */
  277         u_char mask[12];        /* dst[6] + src[6] */
  278 } ipfw_insn_mac;
  279 
  280 /*
  281  * This is used for interface match rules (recv xx, xmit xx).
  282  */
  283 typedef struct  _ipfw_insn_if {
  284         ipfw_insn o;
  285         union {
  286                 struct in_addr ip;
  287                 int glob;
  288         } p;
  289         char name[IFNAMSIZ];
  290 } ipfw_insn_if;
  291 
  292 /*
  293  * This is used for storing an altq queue id number.
  294  */
  295 typedef struct _ipfw_insn_altq {
  296         ipfw_insn       o;
  297         u_int32_t       qid;
  298 } ipfw_insn_altq;
  299 
  300 /*
  301  * This is used for limit rules.
  302  */
  303 typedef struct  _ipfw_insn_limit {
  304         ipfw_insn o;
  305         u_int8_t _pad;
  306         u_int8_t limit_mask;    /* combination of DYN_* below   */
  307 #define DYN_SRC_ADDR    0x1
  308 #define DYN_SRC_PORT    0x2
  309 #define DYN_DST_ADDR    0x4
  310 #define DYN_DST_PORT    0x8
  311 
  312         u_int16_t conn_limit;
  313 } ipfw_insn_limit;
  314 
  315 /*
  316  * This is used for log instructions.
  317  */
  318 typedef struct  _ipfw_insn_log {
  319         ipfw_insn o;
  320         u_int32_t max_log;      /* how many do we log -- 0 = all */
  321         u_int32_t log_left;     /* how many left to log         */
  322 } ipfw_insn_log;
  323 
  324 /*
  325  * Data structures required by both ipfw(8) and ipfw(4) but not part of the
  326  * management API are protected by IPFW_INTERNAL.
  327  */
  328 #ifdef IPFW_INTERNAL
  329 /* Server pool support (LSNAT). */
  330 struct cfg_spool {
  331         LIST_ENTRY(cfg_spool)   _next;          /* chain of spool instances */
  332         struct in_addr          addr;
  333         u_short                 port;
  334 };
  335 #endif
  336 
  337 /* Redirect modes id. */
  338 #define REDIR_ADDR      0x01
  339 #define REDIR_PORT      0x02
  340 #define REDIR_PROTO     0x04
  341 
  342 #ifdef IPFW_INTERNAL
  343 /* Nat redirect configuration. */
  344 struct cfg_redir {
  345         LIST_ENTRY(cfg_redir)   _next;          /* chain of redir instances */
  346         u_int16_t               mode;           /* type of redirect mode */
  347         struct in_addr          laddr;          /* local ip address */
  348         struct in_addr          paddr;          /* public ip address */
  349         struct in_addr          raddr;          /* remote ip address */
  350         u_short                 lport;          /* local port */
  351         u_short                 pport;          /* public port */
  352         u_short                 rport;          /* remote port  */
  353         u_short                 pport_cnt;      /* number of public ports */
  354         u_short                 rport_cnt;      /* number of remote ports */
  355         int                     proto;          /* protocol: tcp/udp */
  356         struct alias_link       **alink;        
  357         /* num of entry in spool chain */
  358         u_int16_t               spool_cnt;      
  359         /* chain of spool instances */
  360         LIST_HEAD(spool_chain, cfg_spool) spool_chain;
  361 };
  362 #endif
  363 
  364 #define NAT_BUF_LEN     1024
  365 
  366 #ifdef IPFW_INTERNAL
  367 /* Nat configuration data struct. */
  368 struct cfg_nat {
  369         /* chain of nat instances */
  370         LIST_ENTRY(cfg_nat)     _next;
  371         int                     id;                     /* nat id */
  372         struct in_addr          ip;                     /* nat ip address */
  373         char                    if_name[IF_NAMESIZE];   /* interface name */
  374         int                     mode;                   /* aliasing mode */
  375         struct libalias         *lib;                   /* libalias instance */
  376         /* number of entry in spool chain */
  377         int                     redir_cnt;              
  378         /* chain of redir instances */
  379         LIST_HEAD(redir_chain, cfg_redir) redir_chain;  
  380 };
  381 #endif
  382 
  383 #define SOF_NAT         sizeof(struct cfg_nat)
  384 #define SOF_REDIR       sizeof(struct cfg_redir)
  385 #define SOF_SPOOL       sizeof(struct cfg_spool)
  386 
  387 /* Nat command. */
  388 typedef struct  _ipfw_insn_nat {
  389         ipfw_insn       o;
  390         struct cfg_nat *nat;    
  391 } ipfw_insn_nat;
  392 
  393 /* Apply ipv6 mask on ipv6 addr */
  394 #define APPLY_MASK(addr,mask)                          \
  395     (addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \
  396     (addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \
  397     (addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \
  398     (addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3];
  399 
  400 /* Structure for ipv6 */
  401 typedef struct _ipfw_insn_ip6 {
  402        ipfw_insn o;
  403        struct in6_addr addr6;
  404        struct in6_addr mask6;
  405 } ipfw_insn_ip6;
  406 
  407 /* Used to support icmp6 types */
  408 typedef struct _ipfw_insn_icmp6 {
  409        ipfw_insn o;
  410        uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h
  411                        *     define ICMP6_MAXTYPE
  412                        *     as follows: n = ICMP6_MAXTYPE/32 + 1
  413                         *     Actually is 203 
  414                        */
  415 } ipfw_insn_icmp6;
  416 
  417 /*
  418  * Here we have the structure representing an ipfw rule.
  419  *
  420  * It starts with a general area (with link fields and counters)
  421  * followed by an array of one or more instructions, which the code
  422  * accesses as an array of 32-bit values.
  423  *
  424  * Given a rule pointer  r:
  425  *
  426  *  r->cmd              is the start of the first instruction.
  427  *  ACTION_PTR(r)       is the start of the first action (things to do
  428  *                      once a rule matched).
  429  *
  430  * When assembling instruction, remember the following:
  431  *
  432  *  + if a rule has a "keep-state" (or "limit") option, then the
  433  *      first instruction (at r->cmd) MUST BE an O_PROBE_STATE
  434  *  + if a rule has a "log" option, then the first action
  435  *      (at ACTION_PTR(r)) MUST be O_LOG
  436  *  + if a rule has an "altq" option, it comes after "log"
  437  *  + if a rule has an O_TAG option, it comes after "log" and "altq"
  438  *
  439  * NOTE: we use a simple linked list of rules because we never need
  440  *      to delete a rule without scanning the list. We do not use
  441  *      queue(3) macros for portability and readability.
  442  */
  443 
  444 struct ip_fw {
  445         struct ip_fw    *next;          /* linked list of rules         */
  446         struct ip_fw    *next_rule;     /* ptr to next [skipto] rule    */
  447         /* 'next_rule' is used to pass up 'set_disable' status          */
  448 
  449         u_int16_t       act_ofs;        /* offset of action in 32-bit units */
  450         u_int16_t       cmd_len;        /* # of 32-bit words in cmd     */
  451         u_int16_t       rulenum;        /* rule number                  */
  452         u_int8_t        set;            /* rule set (0..31)             */
  453 #define RESVD_SET       31      /* set for default and persistent rules */
  454         u_int8_t        _pad;           /* padding                      */
  455 
  456         /* These fields are present in all rules.                       */
  457         u_int64_t       pcnt;           /* Packet counter               */
  458         u_int64_t       bcnt;           /* Byte counter                 */
  459         u_int32_t       timestamp;      /* tv_sec of last match         */
  460 
  461         ipfw_insn       cmd[1];         /* storage for commands         */
  462 };
  463 
  464 #define ACTION_PTR(rule)                                \
  465         (ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) )
  466 
  467 #define RULESIZE(rule)  (sizeof(struct ip_fw) + \
  468         ((struct ip_fw *)(rule))->cmd_len * 4 - 4)
  469 
  470 /*
  471  * This structure is used as a flow mask and a flow id for various
  472  * parts of the code.
  473  */
  474 struct ipfw_flow_id {
  475         u_int32_t       dst_ip;
  476         u_int32_t       src_ip;
  477         u_int16_t       dst_port;
  478         u_int16_t       src_port;
  479         u_int8_t        fib;
  480         u_int8_t        proto;
  481         u_int8_t        flags;  /* protocol-specific flags */
  482         uint8_t         addr_type; /* 4 = ipv4, 6 = ipv6, 1=ether ? */
  483         struct in6_addr dst_ip6;        /* could also store MAC addr! */
  484         struct in6_addr src_ip6;
  485         u_int32_t       flow_id6;
  486         u_int32_t       frag_id6;
  487 };
  488 
  489 #define IS_IP6_FLOW_ID(id)      ((id)->addr_type == 6)
  490 
  491 /*
  492  * Dynamic ipfw rule.
  493  */
  494 typedef struct _ipfw_dyn_rule ipfw_dyn_rule;
  495 
  496 struct _ipfw_dyn_rule {
  497         ipfw_dyn_rule   *next;          /* linked list of rules.        */
  498         struct ip_fw *rule;             /* pointer to rule              */
  499         /* 'rule' is used to pass up the rule number (from the parent)  */
  500 
  501         ipfw_dyn_rule *parent;          /* pointer to parent rule       */
  502         u_int64_t       pcnt;           /* packet match counter         */
  503         u_int64_t       bcnt;           /* byte match counter           */
  504         struct ipfw_flow_id id;         /* (masked) flow id             */
  505         u_int32_t       expire;         /* expire time                  */
  506         u_int32_t       bucket;         /* which bucket in hash table   */
  507         u_int32_t       state;          /* state of this rule (typically a
  508                                          * combination of TCP flags)
  509                                          */
  510         u_int32_t       ack_fwd;        /* most recent ACKs in forward  */
  511         u_int32_t       ack_rev;        /* and reverse directions (used */
  512                                         /* to generate keepalives)      */
  513         u_int16_t       dyn_type;       /* rule type                    */
  514         u_int16_t       count;          /* refcount                     */
  515 };
  516 
  517 /*
  518  * Definitions for IP option names.
  519  */
  520 #define IP_FW_IPOPT_LSRR        0x01
  521 #define IP_FW_IPOPT_SSRR        0x02
  522 #define IP_FW_IPOPT_RR          0x04
  523 #define IP_FW_IPOPT_TS          0x08
  524 
  525 /*
  526  * Definitions for TCP option names.
  527  */
  528 #define IP_FW_TCPOPT_MSS        0x01
  529 #define IP_FW_TCPOPT_WINDOW     0x02
  530 #define IP_FW_TCPOPT_SACK       0x04
  531 #define IP_FW_TCPOPT_TS         0x08
  532 #define IP_FW_TCPOPT_CC         0x10
  533 
  534 #define ICMP_REJECT_RST         0x100   /* fake ICMP code (send a TCP RST) */
  535 #define ICMP6_UNREACH_RST       0x100   /* fake ICMPv6 code (send a TCP RST) */
  536 
  537 /*
  538  * These are used for lookup tables.
  539  */
  540 typedef struct  _ipfw_table_entry {
  541         in_addr_t       addr;           /* network address              */
  542         u_int32_t       value;          /* value                        */
  543         u_int16_t       tbl;            /* table number                 */
  544         u_int8_t        masklen;        /* mask length                  */
  545 } ipfw_table_entry;
  546 
  547 typedef struct  _ipfw_table {
  548         u_int32_t       size;           /* size of entries in bytes     */
  549         u_int32_t       cnt;            /* # of entries                 */
  550         u_int16_t       tbl;            /* table number                 */
  551         ipfw_table_entry ent[0];        /* entries                      */
  552 } ipfw_table;
  553 
  554 #define IP_FW_TABLEARG  65535
  555 
  556 /*
  557  * Main firewall chains definitions and global var's definitions.
  558  */
  559 #ifdef _KERNEL
  560 
  561 /* Return values from ipfw_chk() */
  562 enum {
  563         IP_FW_PASS = 0,
  564         IP_FW_DENY,
  565         IP_FW_DIVERT,
  566         IP_FW_TEE,
  567         IP_FW_DUMMYNET,
  568         IP_FW_NETGRAPH,
  569         IP_FW_NGTEE,
  570         IP_FW_NAT,
  571 };
  572 
  573 /* flags for divert mtag */
  574 #define IP_FW_DIVERT_LOOPBACK_FLAG      0x00080000
  575 #define IP_FW_DIVERT_OUTPUT_FLAG        0x00100000
  576 
  577 /*
  578  * Structure for collecting parameters to dummynet for ip6_output forwarding
  579  */
  580 struct _ip6dn_args {
  581        struct ip6_pktopts *opt_or;
  582        struct route_in6 ro_or;
  583        int flags_or;
  584        struct ip6_moptions *im6o_or;
  585        struct ifnet *origifp_or;
  586        struct ifnet *ifp_or;
  587        struct sockaddr_in6 dst_or;
  588        u_long mtu_or;
  589        struct route_in6 ro_pmtu_or;
  590 };
  591 
  592 /*
  593  * Arguments for calling ipfw_chk() and dummynet_io(). We put them
  594  * all into a structure because this way it is easier and more
  595  * efficient to pass variables around and extend the interface.
  596  */
  597 struct ip_fw_args {
  598         struct mbuf     *m;             /* the mbuf chain               */
  599         struct ifnet    *oif;           /* output interface             */
  600         struct sockaddr_in *next_hop;   /* forward address              */
  601         struct ip_fw    *rule;          /* matching rule                */
  602         struct ether_header *eh;        /* for bridged packets          */
  603 
  604         struct ipfw_flow_id f_id;       /* grabbed from IP header       */
  605         u_int32_t       cookie;         /* a cookie depending on rule action */
  606         struct inpcb    *inp;
  607 
  608         struct _ip6dn_args      dummypar; /* dummynet->ip6_output */
  609         struct sockaddr_in hopstore;    /* store here if cannot use a pointer */
  610 };
  611 
  612 /*
  613  * Function definitions.
  614  */
  615 
  616 /* Firewall hooks */
  617 struct sockopt;
  618 struct dn_flow_set;
  619 
  620 int ipfw_check_in(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp);
  621 int ipfw_check_out(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp);
  622 
  623 int ipfw_chk(struct ip_fw_args *);
  624 
  625 int ipfw_init(void);
  626 void ipfw_destroy(void);
  627 
  628 typedef int ip_fw_ctl_t(struct sockopt *);
  629 extern ip_fw_ctl_t *ip_fw_ctl_ptr;
  630 extern int fw_one_pass;
  631 extern int fw_enable;
  632 #ifdef INET6
  633 extern int fw6_enable;
  634 #endif
  635 
  636 /* For kernel ipfw_ether and ipfw_bridge. */
  637 typedef int ip_fw_chk_t(struct ip_fw_args *args);
  638 extern  ip_fw_chk_t     *ip_fw_chk_ptr;
  639 #define IPFW_LOADED     (ip_fw_chk_ptr != NULL)
  640 
  641 #ifdef IPFW_INTERNAL
  642 
  643 #define        IPFW_TABLES_MAX         128
  644 struct ip_fw_chain {
  645        struct ip_fw    *rules;         /* list of rules */
  646        struct ip_fw    *reap;          /* list of rules to reap */
  647        LIST_HEAD(, cfg_nat) nat;       /* list of nat entries */
  648        struct radix_node_head *tables[IPFW_TABLES_MAX];
  649        struct rwlock   rwmtx;
  650 };
  651 #define        IPFW_LOCK_INIT(_chain) \
  652        rw_init(&(_chain)->rwmtx, "IPFW static rules")
  653 #define        IPFW_LOCK_DESTROY(_chain)       rw_destroy(&(_chain)->rwmtx)
  654 #define        IPFW_WLOCK_ASSERT(_chain)       rw_assert(&(_chain)->rwmtx, RA_WLOCKED)
  655 
  656 #define IPFW_RLOCK(p) rw_rlock(&(p)->rwmtx)
  657 #define IPFW_RUNLOCK(p) rw_runlock(&(p)->rwmtx)
  658 #define IPFW_WLOCK(p) rw_wlock(&(p)->rwmtx)
  659 #define IPFW_WUNLOCK(p) rw_wunlock(&(p)->rwmtx)
  660 
  661 #define LOOKUP_NAT(l, i, p) do {                                       \
  662                LIST_FOREACH((p), &(l.nat), _next) {                    \
  663                        if ((p)->id == (i)) {                           \
  664                                break;                                  \
  665                        }                                               \
  666                }                                                       \
  667        } while (0)
  668 
  669 typedef int ipfw_nat_t(struct ip_fw_args *, struct cfg_nat *, struct mbuf *);
  670 typedef int ipfw_nat_cfg_t(struct sockopt *);
  671 #endif
  672 
  673 #endif /* _KERNEL */
  674 #endif /* _IPFW2_H */

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