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- /* $KAME: ip6_fw.h,v 1.2 2000/02/22 14:04:21 itojun Exp $ */
-
- /*
- * Copyright (c) 1993 Daniel Boulet
- * Copyright (c) 1994 Ugen J.S.Antsilevich
- *
- * Redistribution and use in source forms, with and without modification,
- * are permitted provided that this entire comment appears intact.
- *
- * Redistribution in binary form may occur without any restrictions.
- * Obviously, it would be nice if you gave credit where credit is due
- * but requiring it would be too onerous.
- *
- * This software is provided ``AS IS'' without any warranties of any kind.
- *
- */
-
- #ifndef _IP6_FW_H
- #define _IP6_FW_H
-
- #include <net/if.h>
-
- /*
- * This union structure identifies an interface, either explicitly
- * by name or implicitly by IP address. The flags IP_FW_F_IIFNAME
- * and IP_FW_F_OIFNAME say how to interpret this structure. An
- * interface unit number of -1 matches any unit number, while an
- * IP address of 0.0.0.0 indicates matches any interface.
- *
- * The receive and transmit interfaces are only compared against the
- * the packet if the corresponding bit (IP_FW_F_IIFACE or IP_FW_F_OIFACE)
- * is set. Note some packets lack a receive or transmit interface
- * (in which case the missing "interface" never matches).
- */
-
- union ip6_fw_if {
- struct in6_addr fu_via_ip6; /* Specified by IPv6 address */
- struct { /* Specified by interface name */
- #define FW_IFNLEN IFNAMSIZ
- char name[FW_IFNLEN];
- short unit; /* -1 means match any unit */
- } fu_via_if;
- };
-
- /*
- * Format of an IP firewall descriptor
- *
- * fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order.
- * fw_flg and fw_n*p are stored in host byte order (of course).
- * Port numbers are stored in HOST byte order.
- * Warning: setsockopt() will fail if sizeof(struct ip_fw) > MLEN (108)
- */
-
- struct ip6_fw {
- u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */
- struct in6_addr fw_src, fw_dst; /* Source and destination IPv6 addr */
- struct in6_addr fw_smsk, fw_dmsk; /* Mask for src and dest IPv6 addr */
- u_short fw_number; /* Rule number */
- u_short fw_flg; /* Flags word */
- #define IPV6_FW_MAX_PORTS 10 /* A reasonable maximum */
- u_short fw_pts[IPV6_FW_MAX_PORTS]; /* Array of port numbers to match */
- u_char fw_ip6opt,fw_ip6nopt; /* IPv6 options set/unset */
- u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */
- #define IPV6_FW_ICMPTYPES_DIM (32 / (sizeof(unsigned) * 8))
- unsigned fw_icmp6types[IPV6_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */
- long timestamp; /* timestamp (tv_sec) of last match */
- union ip6_fw_if fw_in_if, fw_out_if;/* Incoming and outgoing interfaces */
- union {
- u_short fu_divert_port; /* Divert/tee port (options IP6DIVERT) */
- u_short fu_skipto_rule; /* SKIPTO command rule number */
- u_short fu_reject_code; /* REJECT response code */
- } fw_un;
- u_char fw_prot; /* IPv6 protocol */
- u_char fw_nports; /* N'of src ports and # of dst ports */
- /* in ports array (dst ports follow */
- /* src ports; max of 10 ports in all; */
- /* count of 0 means match all ports) */
- };
-
- #define IPV6_FW_GETNSRCP(rule) ((rule)->fw_nports & 0x0f)
- #define IPV6_FW_SETNSRCP(rule, n) do { \
- (rule)->fw_nports &= ~0x0f; \
- (rule)->fw_nports |= (n); \
- } while (0)
- #define IPV6_FW_GETNDSTP(rule) ((rule)->fw_nports >> 4)
- #define IPV6_FW_SETNDSTP(rule, n) do { \
- (rule)->fw_nports &= ~0xf0; \
- (rule)->fw_nports |= (n) << 4;\
- } while (0)
-
- #define fw_divert_port fw_un.fu_divert_port
- #define fw_skipto_rule fw_un.fu_skipto_rule
- #define fw_reject_code fw_un.fu_reject_code
-
- struct ip6_fw_chain {
- LIST_ENTRY(ip6_fw_chain) chain;
- struct ip6_fw *rule;
- };
-
- /*
- * Values for "flags" field .
- */
- #define IPV6_FW_F_IN 0x0001 /* Check inbound packets */
- #define IPV6_FW_F_OUT 0x0002 /* Check outbound packets */
- #define IPV6_FW_F_IIFACE 0x0004 /* Apply inbound interface test */
- #define IPV6_FW_F_OIFACE 0x0008 /* Apply outbound interface test */
-
- #define IPV6_FW_F_COMMAND 0x0070 /* Mask for type of chain entry: */
- #define IPV6_FW_F_DENY 0x0000 /* This is a deny rule */
- #define IPV6_FW_F_REJECT 0x0010 /* Deny and send a response packet */
- #define IPV6_FW_F_ACCEPT 0x0020 /* This is an accept rule */
- #define IPV6_FW_F_COUNT 0x0030 /* This is a count rule */
- #define IPV6_FW_F_DIVERT 0x0040 /* This is a divert rule */
- #define IPV6_FW_F_TEE 0x0050 /* This is a tee rule */
- #define IPV6_FW_F_SKIPTO 0x0060 /* This is a skipto rule */
-
- #define IPV6_FW_F_PRN 0x0080 /* Print if this rule matches */
-
- #define IPV6_FW_F_SRNG 0x0100 /* The first two src ports are a min *
- * and max range (stored in host byte *
- * order). */
-
- #define IPV6_FW_F_DRNG 0x0200 /* The first two dst ports are a min *
- * and max range (stored in host byte *
- * order). */
-
- #define IPV6_FW_F_IIFNAME 0x0400 /* In interface by name/unit (not IP) */
- #define IPV6_FW_F_OIFNAME 0x0800 /* Out interface by name/unit (not IP) */
-
- #define IPV6_FW_F_INVSRC 0x1000 /* Invert sense of src check */
- #define IPV6_FW_F_INVDST 0x2000 /* Invert sense of dst check */
-
- #define IPV6_FW_F_FRAG 0x4000 /* Fragment */
-
- #define IPV6_FW_F_ICMPBIT 0x8000 /* ICMP type bitmap is valid */
-
- #define IPV6_FW_F_MASK 0xFFFF /* All possible flag bits mask */
-
- /*
- * For backwards compatibility with rules specifying "via iface" but
- * not restricted to only "in" or "out" packets, we define this combination
- * of bits to represent this configuration.
- */
-
- #define IF6_FW_F_VIAHACK (IPV6_FW_F_IN|IPV6_FW_F_OUT|IPV6_FW_F_IIFACE|IPV6_FW_F_OIFACE)
-
- /*
- * Definitions for REJECT response codes.
- * Values less than 256 correspond to ICMP unreachable codes.
- */
- #define IPV6_FW_REJECT_RST 0x0100 /* TCP packets: send RST */
-
- /*
- * Definitions for IPv6 option names.
- */
- #define IPV6_FW_IP6OPT_HOPOPT 0x01
- #define IPV6_FW_IP6OPT_ROUTE 0x02
- #define IPV6_FW_IP6OPT_FRAG 0x04
- #define IPV6_FW_IP6OPT_ESP 0x08
- #define IPV6_FW_IP6OPT_AH 0x10
- #define IPV6_FW_IP6OPT_NONXT 0x20
- #define IPV6_FW_IP6OPT_OPTS 0x40
-
- /*
- * Definitions for TCP flags.
- */
- #define IPV6_FW_TCPF_FIN TH_FIN
- #define IPV6_FW_TCPF_SYN TH_SYN
- #define IPV6_FW_TCPF_RST TH_RST
- #define IPV6_FW_TCPF_PSH TH_PUSH
- #define IPV6_FW_TCPF_ACK TH_ACK
- #define IPV6_FW_TCPF_URG TH_URG
- #define IPV6_FW_TCPF_ESTAB 0x40
-
- /*
- * Names for IPV6_FW sysctl objects
- */
- #define IP6FWCTL_DEBUG 1
- #define IP6FWCTL_VERBOSE 2
- #define IP6FWCTL_VERBLIMIT 3
- #define IP6FWCTL_MAXID 4
-
- #define IP6FWCTL_NAMES { \
- { 0, 0 }, \
- { 0, 0 }, \
- { "debug", CTLTYPE_INT }, \
- { "verbose", CTLTYPE_INT }, \
- { "verbose_limit", CTLTYPE_INT }, \
- }
-
- #define IP6FWCTL_VARS { \
- 0, \
- 0, \
- &fw6_debug, \
- &fw6_verbose, \
- &fw6_verbose_limit, \
- }
-
- /*
- * Main firewall chains definitions and global var's definitions.
- */
- #if KERNEL
-
- /*
- * Function definitions.
- */
- void ip6_fw_init(void);
-
- /* Firewall hooks */
- struct ip6_hdr;
- typedef int ip6_fw_chk_t __P((struct ip6_hdr**, struct ifnet*,
- u_short *, struct mbuf**));
- typedef int ip6_fw_ctl_t __P((int, struct mbuf**));
- extern ip6_fw_chk_t *ip6_fw_chk_ptr;
- extern ip6_fw_ctl_t *ip6_fw_ctl_ptr;
-
- #endif /* KERNEL */
-
- #endif /* _IP6_FW_H */
-