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- /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
- /*
- * 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 _IP_FW_H
- #define _IP_FW_H
-
- #include <sys/queue.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 ip_fw_if {
- struct in_addr fu_via_ip; /* Specified by IP address */
- struct { /* Specified by interface name */
- #define FW_IFNLEN 10 /* need room ! was 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 ip_fw {
- u_int64_t fw_pcnt,fw_bcnt; /* Packet and byte counters */
- struct in_addr fw_src, fw_dst; /* Source and destination IP addr */
- struct in_addr fw_smsk, fw_dmsk; /* Mask for src and dest IP addr */
- u_short fw_number; /* Rule number */
- u_int fw_flg; /* Flags word */
- #define IP_FW_MAX_PORTS 10 /* A reasonable maximum */
- union {
- u_short fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */
- #define IP_FW_ICMPTYPES_MAX 128
- #define IP_FW_ICMPTYPES_DIM (IP_FW_ICMPTYPES_MAX / (sizeof(unsigned) * 8))
- unsigned fw_icmptypes[IP_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */
- } fw_uar;
- u_char fw_ipopt,fw_ipnopt; /* IP options set/unset */
- u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */
- long timestamp; /* timestamp (tv_sec) of last match */
- union ip_fw_if fw_in_if, fw_out_if; /* Incoming and outgoing interfaces */
- union {
- u_short fu_divert_port; /* Divert/tee port (options IPDIVERT) */
- u_short fu_pipe_nr; /* pipe number (option DUMMYNET) */
- u_short fu_skipto_rule; /* SKIPTO command rule number */
- u_short fu_reject_code; /* REJECT response code */
- struct sockaddr_in fu_fwd_ip;
- } fw_un;
- u_char fw_prot; /* IP 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) */
- void *pipe_ptr; /* Pipe ptr in case of dummynet pipe */
- void *next_rule_ptr ; /* next rule in case of match */
- };
-
- #define IP_FW_GETNSRCP(rule) ((rule)->fw_nports & 0x0f)
- #define IP_FW_SETNSRCP(rule, n) do { \
- (rule)->fw_nports &= ~0x0f; \
- (rule)->fw_nports |= (n); \
- } while (0)
- #define IP_FW_GETNDSTP(rule) ((rule)->fw_nports >> 4)
- #define IP_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
- #define fw_pipe_nr fw_un.fu_pipe_nr
- #define fw_fwd_ip fw_un.fu_fwd_ip
-
- struct ip_fw_chain {
- LIST_ENTRY(ip_fw_chain) chain;
- struct ip_fw *rule;
- };
-
- /*
- * Values for "flags" field .
- */
- #define IP_FW_F_COMMAND 0x000000ff /* Mask for type of chain entry: */
- #define IP_FW_F_DENY 0x00000000 /* This is a deny rule */
- #define IP_FW_F_REJECT 0x00000001 /* Deny and send a response packet */
- #define IP_FW_F_ACCEPT 0x00000002 /* This is an accept rule */
- #define IP_FW_F_COUNT 0x00000003 /* This is a count rule */
- #define IP_FW_F_DIVERT 0x00000004 /* This is a divert rule */
- #define IP_FW_F_TEE 0x00000005 /* This is a tee rule */
- #define IP_FW_F_SKIPTO 0x00000006 /* This is a skipto rule */
- #define IP_FW_F_FWD 0x00000007 /* This is a "change forwarding address" rule */
- #define IP_FW_F_PIPE 0x00000008 /* This is a dummynet rule */
-
- #define IP_FW_F_IN 0x00000100 /* Check inbound packets */
- #define IP_FW_F_OUT 0x00000200 /* Check outbound packets */
- #define IP_FW_F_IIFACE 0x00000400 /* Apply inbound interface test */
- #define IP_FW_F_OIFACE 0x00000800 /* Apply outbound interface test */
-
- #define IP_FW_F_PRN 0x00001000 /* Print if this rule matches */
-
- #define IP_FW_F_SRNG 0x00002000 /* The first two src ports are a min *
- * and max range (stored in host byte *
- * order). */
-
- #define IP_FW_F_DRNG 0x00004000 /* The first two dst ports are a min *
- * and max range (stored in host byte *
- * order). */
-
- #define IP_FW_F_FRAG 0x00008000 /* Fragment */
-
- #define IP_FW_F_IIFNAME 0x00010000 /* In interface by name/unit (not IP) */
- #define IP_FW_F_OIFNAME 0x00020000 /* Out interface by name/unit (not IP) */
-
- #define IP_FW_F_INVSRC 0x00040000 /* Invert sense of src check */
- #define IP_FW_F_INVDST 0x00080000 /* Invert sense of dst check */
-
- #define IP_FW_F_ICMPBIT 0x00100000 /* ICMP type bitmap is valid */
-
- #define IP_FW_F_MASK 0x001FFFFF /* 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 IF_FW_F_VIAHACK (IP_FW_F_IN|IP_FW_F_OUT|IP_FW_F_IIFACE|IP_FW_F_OIFACE)
-
- /*
- * Definitions for REJECT response codes.
- * Values less than 256 correspond to ICMP unreachable codes.
- */
- #define IP_FW_REJECT_RST 0x0100 /* TCP packets: send RST */
-
- /*
- * Definitions for IP option names.
- */
- #define IP_FW_IPOPT_LSRR 0x01
- #define IP_FW_IPOPT_SSRR 0x02
- #define IP_FW_IPOPT_RR 0x04
- #define IP_FW_IPOPT_TS 0x08
-
- /*
- * Definitions for TCP flags.
- */
- #define IP_FW_TCPF_FIN TH_FIN
- #define IP_FW_TCPF_SYN TH_SYN
- #define IP_FW_TCPF_RST TH_RST
- #define IP_FW_TCPF_PSH TH_PUSH
- #define IP_FW_TCPF_ACK TH_ACK
- #define IP_FW_TCPF_URG TH_URG
- #define IP_FW_TCPF_ESTAB 0x40
-
- /*
- * Main firewall chains definitions and global var's definitions.
- */
- #ifdef KERNEL
-
- /*
- * Function definitions.
- */
- void ip_fw_init __P((void));
-
- /* Firewall hooks */
- struct ip;
- struct sockopt;
- typedef int ip_fw_chk_t __P((struct ip **, int, struct ifnet *, u_int16_t *,
- struct mbuf **, struct ip_fw_chain **, struct sockaddr_in **));
- typedef int ip_fw_ctl_t __P((struct sockopt *));
- extern ip_fw_chk_t *ip_fw_chk_ptr;
- extern ip_fw_ctl_t *ip_fw_ctl_ptr;
-
- /* IP NAT hooks */
- typedef int ip_nat_t __P((struct ip **, struct mbuf **, struct ifnet *, int));
- typedef int ip_nat_ctl_t __P((struct sockopt *));
- extern ip_nat_t *ip_nat_ptr;
- extern ip_nat_ctl_t *ip_nat_ctl_ptr;
- #define IP_NAT_IN 0x00000001
- #define IP_NAT_OUT 0x00000002
-
- #endif /* KERNEL */
-
- #endif /* _IP_FW_H */
-