The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_fw.h

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    1 /*      $FreeBSD: releng/6.1/sys/netinet6/ip6_fw.h 158179 2006-04-30 16:44:43Z cvs2svn $        */
    2 /*      $KAME: ip6_fw.h,v 1.9 2001/08/01 04:29:57 sumikawa Exp $        */
    3 
    4 /*-
    5  * Copyright (C) 1998, 1999, 2000 and 2001 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*-
   34  * Copyright (c) 1993 Daniel Boulet
   35  * Copyright (c) 1994 Ugen J.S.Antsilevich
   36  *
   37  * Redistribution and use in source forms, with and without modification,
   38  * are permitted provided that this entire comment appears intact.
   39  *
   40  * Redistribution in binary form may occur without any restrictions.
   41  * Obviously, it would be nice if you gave credit where credit is due
   42  * but requiring it would be too onerous.
   43  *
   44  * This software is provided ``AS IS'' without any warranties of any kind.
   45  *
   46  */
   47 
   48 #ifndef _IP6_FW_H
   49 #define _IP6_FW_H
   50 
   51 #include <net/if.h>
   52 
   53 /*
   54  * This union structure identifies an interface, either explicitly
   55  * by name or implicitly by IP address. The flags IP_FW_F_IIFNAME
   56  * and IP_FW_F_OIFNAME say how to interpret this structure. An
   57  * interface unit number of -1 matches any unit number, while an
   58  * IP address of 0.0.0.0 indicates matches any interface.
   59  *
   60  * The receive and transmit interfaces are only compared against the
   61  * the packet if the corresponding bit (IP_FW_F_IIFACE or IP_FW_F_OIFACE)
   62  * is set. Note some packets lack a receive or transmit interface
   63  * (in which case the missing "interface" never matches).
   64  */
   65 
   66 union ip6_fw_if {
   67     struct in6_addr fu_via_ip6; /* Specified by IPv6 address */
   68     struct {                    /* Specified by interface name */
   69 #define IP6FW_IFNLEN     IFNAMSIZ
   70             char  name[IP6FW_IFNLEN];
   71             short glob;         /* Is name a pattern or a name? */
   72     } fu_via_if;
   73 };
   74 
   75 /*
   76  * Format of an IP firewall descriptor
   77  *
   78  * fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order.
   79  * fw_flg and fw_n*p are stored in host byte order (of course).
   80  * Port numbers are stored in HOST byte order.
   81  * Warning: setsockopt() will fail if sizeof(struct ip_fw) > MLEN (108)
   82  */
   83 
   84 struct ip6_fw {
   85     u_long fw_pcnt,fw_bcnt;             /* Packet and byte counters */
   86     struct in6_addr fw_src, fw_dst;     /* Source and destination IPv6 addr */
   87     struct in6_addr fw_smsk, fw_dmsk;   /* Mask for src and dest IPv6 addr */
   88     u_short fw_number;                  /* Rule number */
   89     u_short fw_flg;                     /* Flags word */
   90 #define IPV6_FW_MAX_PORTS       10      /* A reasonable maximum */
   91     u_int fw_ipflg;                     /* IP flags word */
   92     u_short fw_pts[IPV6_FW_MAX_PORTS];  /* Array of port numbers to match */
   93     u_char fw_ip6opt,fw_ip6nopt;        /* IPv6 options set/unset */
   94     u_char fw_tcpf,fw_tcpnf;            /* TCP flags set/unset */
   95 #define IPV6_FW_ICMPTYPES_DIM (256 / (sizeof(unsigned) * 8))
   96     unsigned fw_icmp6types[IPV6_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */
   97     long timestamp;                     /* timestamp (tv_sec) of last match */
   98     union ip6_fw_if fw_in_if, fw_out_if;/* Incoming and outgoing interfaces */
   99     union {
  100         u_short fu_divert_port;         /* Divert/tee port (options IP6DIVERT) */
  101         u_short fu_skipto_rule;         /* SKIPTO command rule number */
  102         u_short fu_reject_code;         /* REJECT response code */
  103     } fw_un;
  104     u_char fw_prot;                     /* IPv6 protocol */
  105     u_char fw_nports;                   /* N'of src ports and # of dst ports */
  106                                         /* in ports array (dst ports follow */
  107                                         /* src ports; max of 10 ports in all; */
  108                                         /* count of 0 means match all ports) */
  109 };
  110 
  111 #define IPV6_FW_GETNSRCP(rule)          ((rule)->fw_nports & 0x0f)
  112 #define IPV6_FW_SETNSRCP(rule, n)               do {                            \
  113                                           (rule)->fw_nports &= ~0x0f;   \
  114                                           (rule)->fw_nports |= (n);     \
  115                                         } while (/*CONSTCOND*/ 0)
  116 #define IPV6_FW_GETNDSTP(rule)          ((rule)->fw_nports >> 4)
  117 #define IPV6_FW_SETNDSTP(rule, n)               do {                            \
  118                                           (rule)->fw_nports &= ~0xf0;   \
  119                                           (rule)->fw_nports |= (n) << 4;\
  120                                         } while (/*CONSTCOND*/ 0)
  121 
  122 #define fw_divert_port  fw_un.fu_divert_port
  123 #define fw_skipto_rule  fw_un.fu_skipto_rule
  124 #define fw_reject_code  fw_un.fu_reject_code
  125 
  126 struct ip6_fw_chain {
  127         LIST_ENTRY(ip6_fw_chain) chain;
  128         struct ip6_fw    *rule;
  129 };
  130 
  131 /*
  132  * Values for "flags" field .
  133  */
  134 #define IPV6_FW_F_IN    0x0001  /* Check inbound packets                */
  135 #define IPV6_FW_F_OUT   0x0002  /* Check outbound packets               */
  136 #define IPV6_FW_F_IIFACE        0x0004  /* Apply inbound interface test         */
  137 #define IPV6_FW_F_OIFACE        0x0008  /* Apply outbound interface test        */
  138 
  139 #define IPV6_FW_F_COMMAND 0x0070        /* Mask for type of chain entry:        */
  140 #define IPV6_FW_F_DENY  0x0000  /* This is a deny rule                  */
  141 #define IPV6_FW_F_REJECT        0x0010  /* Deny and send a response packet      */
  142 #define IPV6_FW_F_ACCEPT        0x0020  /* This is an accept rule               */
  143 #define IPV6_FW_F_COUNT 0x0030  /* This is a count rule                 */
  144 #define IPV6_FW_F_DIVERT        0x0040  /* This is a divert rule                */
  145 #define IPV6_FW_F_TEE   0x0050  /* This is a tee rule                   */
  146 #define IPV6_FW_F_SKIPTO        0x0060  /* This is a skipto rule                */
  147 
  148 #define IPV6_FW_F_PRN   0x0080  /* Print if this rule matches           */
  149 
  150 #define IPV6_FW_F_SRNG  0x0100  /* The first two src ports are a min    *
  151                                  * and max range (stored in host byte   *
  152                                  * order).                              */
  153 
  154 #define IPV6_FW_F_DRNG  0x0200  /* The first two dst ports are a min    *
  155                                  * and max range (stored in host byte   *
  156                                  * order).                              */
  157 
  158 #define IPV6_FW_F_IIFNAME       0x0400  /* In interface by name/unit (not IP)   */
  159 #define IPV6_FW_F_OIFNAME       0x0800  /* Out interface by name/unit (not IP)  */
  160 
  161 #define IPV6_FW_F_INVSRC        0x1000  /* Invert sense of src check            */
  162 #define IPV6_FW_F_INVDST        0x2000  /* Invert sense of dst check            */
  163 
  164 #define IPV6_FW_F_FRAG  0x4000  /* Fragment                             */
  165 
  166 #define IPV6_FW_F_ICMPBIT 0x8000        /* ICMP type bitmap is valid            */
  167 
  168 #define IPV6_FW_F_MASK  0xFFFF  /* All possible flag bits mask          */
  169 
  170 /*
  171  * Flags for the 'fw_ipflg' field, for comparing values of ip and its protocols. */
  172 #define IPV6_FW_IF_TCPEST 0x00000020    /* established TCP connection   */
  173 #define IPV6_FW_IF_TCPMSK 0x00000020    /* mask of all TCP values */
  174 
  175 /*
  176  * For backwards compatibility with rules specifying "via iface" but
  177  * not restricted to only "in" or "out" packets, we define this combination
  178  * of bits to represent this configuration.
  179  */
  180 
  181 #define IF6_FW_F_VIAHACK        (IPV6_FW_F_IN|IPV6_FW_F_OUT|IPV6_FW_F_IIFACE|IPV6_FW_F_OIFACE)
  182 
  183 /*
  184  * Definitions for REJECT response codes.
  185  * Values less than 256 correspond to ICMP unreachable codes.
  186  */
  187 #define IPV6_FW_REJECT_RST      0x0100          /* TCP packets: send RST */
  188 
  189 /*
  190  * Definitions for IPv6 option names.
  191  */
  192 #define IPV6_FW_IP6OPT_HOPOPT   0x01
  193 #define IPV6_FW_IP6OPT_ROUTE    0x02
  194 #define IPV6_FW_IP6OPT_FRAG     0x04
  195 #define IPV6_FW_IP6OPT_ESP      0x08
  196 #define IPV6_FW_IP6OPT_AH       0x10
  197 #define IPV6_FW_IP6OPT_NONXT    0x20
  198 #define IPV6_FW_IP6OPT_OPTS     0x40
  199 
  200 /*
  201  * Definitions for TCP flags.
  202  */
  203 #define IPV6_FW_TCPF_FIN        TH_FIN
  204 #define IPV6_FW_TCPF_SYN        TH_SYN
  205 #define IPV6_FW_TCPF_RST        TH_RST
  206 #define IPV6_FW_TCPF_PSH        TH_PUSH
  207 #define IPV6_FW_TCPF_ACK        TH_ACK
  208 #define IPV6_FW_TCPF_URG        TH_URG
  209 
  210 /*
  211  * Main firewall chains definitions and global var's definitions.
  212  */
  213 #ifdef _KERNEL
  214 
  215 /*
  216  * Function definitions.
  217  */
  218 void ip6_fw_init(void);
  219 
  220 /* Firewall hooks */
  221 struct ip6_hdr;
  222 typedef int ip6_fw_chk_t __P((struct ip6_hdr**, struct ifnet*,
  223         u_short *, struct mbuf**));
  224 typedef int ip6_fw_ctl_t __P((int, struct mbuf**));
  225 extern  ip6_fw_chk_t *ip6_fw_chk_ptr;
  226 extern  ip6_fw_ctl_t *ip6_fw_ctl_ptr;
  227 extern  int ip6_fw_enable;
  228 
  229 #endif /* _KERNEL */
  230 
  231 #endif /* _IP6_FW_H */

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