210 lines
7.2 KiB
C
210 lines
7.2 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* $Id: ip_fw.h,v 1.37 1999/04/20 13:32:05 peter Exp $
|
|
*/
|
|
|
|
#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 */
|
|
uid_t fw_uid; /* uid to match */
|
|
gid_t fw_gid; /* gid to 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_UID 0x00200000 /* filter by uid */
|
|
|
|
#define IP_FW_F_GID 0x00400000 /* filter by uid */
|
|
|
|
#define IP_FW_F_MASK 0x007FFFFF /* 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;
|
|
|
|
#endif /* KERNEL */
|
|
|
|
#endif /* _IP_FW_H */
|