1 /* $FreeBSD: src/sys/netinet6/ip6_fw.h,v 1.3.2.7 2002/04/28 05:40:27 suz Exp $ */ 2 /* $DragonFly: src/sys/net/ip6fw/ip6_fw.h,v 1.4 2004/01/06 03:17:26 dillon Exp $ */ 3 /* $KAME: ip6_fw.h,v 1.9 2001/08/01 04:29:57 sumikawa Exp $ */ 4 5 /* 6 * Copyright (C) 1998, 1999, 2000 and 2001 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1993 Daniel Boulet 36 * Copyright (c) 1994 Ugen J.S.Antsilevich 37 * 38 * Redistribution and use in source forms, with and without modification, 39 * are permitted provided that this entire comment appears intact. 40 * 41 * Redistribution in binary form may occur without any restrictions. 42 * Obviously, it would be nice if you gave credit where credit is due 43 * but requiring it would be too onerous. 44 * 45 * This software is provided ``AS IS'' without any warranties of any kind. 46 * 47 */ 48 49 #ifndef _IP6_FW_H 50 #define _IP6_FW_H 51 52 #include <net/if.h> 53 54 /* 55 * This union structure identifies an interface, either explicitly 56 * by name or implicitly by IP address. The flags IP_FW_F_IIFNAME 57 * and IP_FW_F_OIFNAME say how to interpret this structure. An 58 * interface unit number of -1 matches any unit number, while an 59 * IP address of 0.0.0.0 indicates matches any interface. 60 * 61 * The receive and transmit interfaces are only compared against the 62 * the packet if the corresponding bit (IP_FW_F_IIFACE or IP_FW_F_OIFACE) 63 * is set. Note some packets lack a receive or transmit interface 64 * (in which case the missing "interface" never matches). 65 */ 66 67 union ip6_fw_if { 68 struct in6_addr fu_via_ip6; /* Specified by IPv6 address */ 69 struct { /* Specified by interface name */ 70 #define IP6FW_IFNLEN IFNAMSIZ 71 char name[IP6FW_IFNLEN]; 72 short glob; 73 } fu_via_if; 74 }; 75 76 /* 77 * Format of an IP firewall descriptor 78 * 79 * fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order. 80 * fw_flg and fw_n*p are stored in host byte order (of course). 81 * Port numbers are stored in HOST byte order. 82 * Warning: setsockopt() will fail if sizeof(struct ip_fw) > MLEN (108) 83 */ 84 85 struct ip6_fw { 86 u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */ 87 struct in6_addr fw_src, fw_dst; /* Source and destination IPv6 addr */ 88 struct in6_addr fw_smsk, fw_dmsk; /* Mask for src and dest IPv6 addr */ 89 u_short fw_number; /* Rule number */ 90 u_short fw_flg; /* Flags word */ 91 #define IPV6_FW_MAX_PORTS 10 /* A reasonable maximum */ 92 u_int fw_ipflg; /* IP flags word */ 93 u_short fw_pts[IPV6_FW_MAX_PORTS]; /* Array of port numbers to match */ 94 u_char fw_ip6opt,fw_ip6nopt; /* IPv6 options set/unset */ 95 u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */ 96 #define IPV6_FW_ICMPTYPES_DIM (256 / (sizeof(unsigned) * 8)) 97 unsigned fw_icmp6types[IPV6_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */ 98 long timestamp; /* timestamp (tv_sec) of last match */ 99 union ip6_fw_if fw_in_if, fw_out_if;/* Incoming and outgoing interfaces */ 100 union { 101 u_short fu_divert_port; /* Divert/tee port (options IP6DIVERT) */ 102 u_short fu_skipto_rule; /* SKIPTO command rule number */ 103 u_short fu_reject_code; /* REJECT response code */ 104 } fw_un; 105 u_char fw_prot; /* IPv6 protocol */ 106 u_char fw_nports; /* N'of src ports and # of dst ports */ 107 /* in ports array (dst ports follow */ 108 /* src ports; max of 10 ports in all; */ 109 /* count of 0 means match all ports) */ 110 }; 111 112 #define IPV6_FW_GETNSRCP(rule) ((rule)->fw_nports & 0x0f) 113 #define IPV6_FW_SETNSRCP(rule, n) do { \ 114 (rule)->fw_nports &= ~0x0f; \ 115 (rule)->fw_nports |= (n); \ 116 } while (0) 117 #define IPV6_FW_GETNDSTP(rule) ((rule)->fw_nports >> 4) 118 #define IPV6_FW_SETNDSTP(rule, n) do { \ 119 (rule)->fw_nports &= ~0xf0; \ 120 (rule)->fw_nports |= (n) << 4;\ 121 } while (0) 122 123 #define fw_divert_port fw_un.fu_divert_port 124 #define fw_skipto_rule fw_un.fu_skipto_rule 125 #define fw_reject_code fw_un.fu_reject_code 126 127 struct ip6_fw_chain { 128 LIST_ENTRY(ip6_fw_chain) chain; 129 struct ip6_fw *rule; 130 }; 131 132 /* 133 * Values for "flags" field . 134 */ 135 #define IPV6_FW_F_IN 0x0001 /* Check inbound packets */ 136 #define IPV6_FW_F_OUT 0x0002 /* Check outbound packets */ 137 #define IPV6_FW_F_IIFACE 0x0004 /* Apply inbound interface test */ 138 #define IPV6_FW_F_OIFACE 0x0008 /* Apply outbound interface test */ 139 140 #define IPV6_FW_F_COMMAND 0x0070 /* Mask for type of chain entry: */ 141 #define IPV6_FW_F_DENY 0x0000 /* This is a deny rule */ 142 #define IPV6_FW_F_REJECT 0x0010 /* Deny and send a response packet */ 143 #define IPV6_FW_F_ACCEPT 0x0020 /* This is an accept rule */ 144 #define IPV6_FW_F_COUNT 0x0030 /* This is a count rule */ 145 #define IPV6_FW_F_DIVERT 0x0040 /* This is a divert rule */ 146 #define IPV6_FW_F_TEE 0x0050 /* This is a tee rule */ 147 #define IPV6_FW_F_SKIPTO 0x0060 /* This is a skipto rule */ 148 149 #define IPV6_FW_F_PRN 0x0080 /* Print if this rule matches */ 150 151 #define IPV6_FW_F_SRNG 0x0100 /* The first two src ports are a min * 152 * and max range (stored in host byte * 153 * order). */ 154 155 #define IPV6_FW_F_DRNG 0x0200 /* The first two dst ports are a min * 156 * and max range (stored in host byte * 157 * order). */ 158 159 #define IPV6_FW_F_IIFNAME 0x0400 /* In interface by name/unit (not IP) */ 160 #define IPV6_FW_F_OIFNAME 0x0800 /* Out interface by name/unit (not IP) */ 161 162 #define IPV6_FW_F_INVSRC 0x1000 /* Invert sense of src check */ 163 #define IPV6_FW_F_INVDST 0x2000 /* Invert sense of dst check */ 164 165 #define IPV6_FW_F_FRAG 0x4000 /* Fragment */ 166 167 #define IPV6_FW_F_ICMPBIT 0x8000 /* ICMP type bitmap is valid */ 168 169 #define IPV6_FW_F_MASK 0xFFFF /* All possible flag bits mask */ 170 171 /* 172 * Flags for the 'fw_ipflg' field, for comparing values of ip and its protocols. */ 173 #define IPV6_FW_IF_TCPEST 0x00000020 /* established TCP connection */ 174 #define IPV6_FW_IF_TCPMSK 0x00000020 /* mask of all TCP values */ 175 176 /* 177 * For backwards compatibility with rules specifying "via iface" but 178 * not restricted to only "in" or "out" packets, we define this combination 179 * of bits to represent this configuration. 180 */ 181 182 #define IF6_FW_F_VIAHACK (IPV6_FW_F_IN|IPV6_FW_F_OUT|IPV6_FW_F_IIFACE|IPV6_FW_F_OIFACE) 183 184 /* 185 * Definitions for REJECT response codes. 186 * Values less than 256 correspond to ICMP unreachable codes. 187 */ 188 #define IPV6_FW_REJECT_RST 0x0100 /* TCP packets: send RST */ 189 190 /* 191 * Definitions for IPv6 option names. 192 */ 193 #define IPV6_FW_IP6OPT_HOPOPT 0x01 194 #define IPV6_FW_IP6OPT_ROUTE 0x02 195 #define IPV6_FW_IP6OPT_FRAG 0x04 196 #define IPV6_FW_IP6OPT_ESP 0x08 197 #define IPV6_FW_IP6OPT_AH 0x10 198 #define IPV6_FW_IP6OPT_NONXT 0x20 199 #define IPV6_FW_IP6OPT_OPTS 0x40 200 201 /* 202 * Definitions for TCP flags. 203 */ 204 #define IPV6_FW_TCPF_FIN TH_FIN 205 #define IPV6_FW_TCPF_SYN TH_SYN 206 #define IPV6_FW_TCPF_RST TH_RST 207 #define IPV6_FW_TCPF_PSH TH_PUSH 208 #define IPV6_FW_TCPF_ACK TH_ACK 209 #define IPV6_FW_TCPF_URG TH_URG 210 211 /* 212 * Main firewall chains definitions and global var's definitions. 213 */ 214 #ifdef _KERNEL 215 216 /* 217 * Function definitions. 218 */ 219 void ip6_fw_init(void); 220 221 /* Firewall hooks */ 222 struct ip6_hdr; 223 typedef int ip6_fw_chk_t (struct ip6_hdr**, struct ifnet*, 224 u_short *, struct mbuf**); 225 typedef int ip6_fw_ctl_t (int, struct mbuf**); 226 extern ip6_fw_chk_t *ip6_fw_chk_ptr; 227 extern ip6_fw_ctl_t *ip6_fw_ctl_ptr; 228 extern int ip6_fw_enable; 229 230 #endif /* _KERNEL */ 231 232 #endif /* _IP6_FW_H */ 233