patch-2.3.99-pre2 linux/include/linux/netfilter_ipv4/ipchains_core.h

• Lines: 194
• Date: Fri Mar 17 10:56:20 2000
• Orig file: v2.3.99-pre1/linux/include/linux/netfilter_ipv4/ipchains_core.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre1/linux/include/linux/netfilter_ipv4/ipchains_core.h linux/include/linux/netfilter_ipv4/ipchains_core.h
@@ -0,0 +1,193 @@
+/*
+ * This code is heavily based on the code in ip_fw.h; see that file for
+ * copyrights and attributions.  This code is basically GPL.
+ *
+ * 15-Feb-1997: Major changes to allow graphs for firewall rules.
+ *              Paul Russell <Paul.Russell@rustcorp.com.au> and
+ *		Michael Neuling <Michael.Neuling@rustcorp.com.au>
+ * 2-Nov-1997: Changed types to __u16, etc.
+ *             Removed IP_FW_F_TCPACK & IP_FW_F_BIDIR.
+ *             Added inverse flags field.
+ *             Removed multiple port specs.
+ */
+
+/*
+ * 	Format of an IP firewall descriptor
+ *
+ * 	src, dst, src_mask, dst_mask are always stored in network byte order.
+ * 	flags are stored in host byte order (of course).
+ * 	Port numbers are stored in HOST byte order.
+ */
+
+#ifndef _IP_FWCHAINS_H
+#define _IP_FWCHAINS_H
+
+#ifdef __KERNEL__
+#include <linux/icmp.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#endif /* __KERNEL__ */
+#define IP_FW_MAX_LABEL_LENGTH 8
+typedef char ip_chainlabel[IP_FW_MAX_LABEL_LENGTH+1];
+
+struct ip_fw
+{
+	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 */
+	__u32 fw_mark;                          /* ID to stamp on packet */
+	__u16 fw_proto;                         /* Protocol, 0 = ANY */
+	__u16 fw_flg;			        /* Flags word */
+        __u16 fw_invflg;                        /* Inverse flags */
+	__u16 fw_spts[2];                       /* Source port range. */
+        __u16 fw_dpts[2];                       /* Destination port range. */
+	__u16 fw_redirpt;                       /* Port to redirect to. */
+	__u16 fw_outputsize;                    /* Max amount to output to
+						   NETLINK */
+	char           fw_vianame[IFNAMSIZ];	/* name of interface "via" */
+	__u8           fw_tosand, fw_tosxor;	/* Revised packet priority */
+};
+
+struct ip_fwuser
+{
+	struct ip_fw ipfw;
+	ip_chainlabel label;
+};
+
+/* Values for "fw_flg" field .  */
+#define IP_FW_F_PRN	0x0001	/* Print packet if it matches */
+#define IP_FW_F_TCPSYN	0x0002	/* For tcp packets-check SYN only */
+#define IP_FW_F_FRAG	0x0004  /* Set if rule is a fragment rule */
+#define IP_FW_F_MARKABS	0x0008  /* Set the mark to fw_mark, not add. */
+#define IP_FW_F_WILDIF	0x0010  /* Need only match start of interface name. */
+#define IP_FW_F_NETLINK 0x0020  /* Redirect to netlink: 2.1.x only */
+#define IP_FW_F_MASK	0x003F	/* All possible flag bits mask   */
+
+/* Values for "fw_invflg" field. */
+#define IP_FW_INV_SRCIP 0x0001  /* Invert the sense of fw_src. */
+#define IP_FW_INV_DSTIP 0x0002  /* Invert the sense of fw_dst. */
+#define IP_FW_INV_PROTO 0x0004  /* Invert the sense of fw_proto. */
+#define IP_FW_INV_SRCPT 0x0008  /* Invert the sense of source ports. */
+#define IP_FW_INV_DSTPT 0x0010  /* Invert the sense of destination ports. */
+#define IP_FW_INV_VIA   0x0020  /* Invert the sense of fw_vianame. */
+#define IP_FW_INV_SYN   0x0040  /* Invert the sense of IP_FW_F_TCPSYN. */
+#define IP_FW_INV_FRAG  0x0080  /* Invert the sense of IP_FW_F_FRAG. */
+
+/*
+ *	New IP firewall options for [gs]etsockopt at the RAW IP level.
+ *	Unlike BSD Linux inherits IP options so you don't have to use
+ * a raw socket for this. Instead we check rights in the calls.  */
+
+#define IP_FW_BASE_CTL  	64	/* base for firewall socket options */
+
+#define IP_FW_APPEND		(IP_FW_BASE_CTL)    /* Takes ip_fwchange */
+#define IP_FW_REPLACE		(IP_FW_BASE_CTL+1)  /* Takes ip_fwnew */
+#define IP_FW_DELETE_NUM	(IP_FW_BASE_CTL+2)  /* Takes ip_fwdelnum */
+#define IP_FW_DELETE		(IP_FW_BASE_CTL+3)  /* Takes ip_fwchange */
+#define IP_FW_INSERT		(IP_FW_BASE_CTL+4)  /* Takes ip_fwnew */
+#define IP_FW_FLUSH		(IP_FW_BASE_CTL+5)  /* Takes ip_chainlabel */
+#define IP_FW_ZERO		(IP_FW_BASE_CTL+6)  /* Takes ip_chainlabel */
+#define IP_FW_CHECK		(IP_FW_BASE_CTL+7)  /* Takes ip_fwtest */
+#define IP_FW_MASQ_TIMEOUTS	(IP_FW_BASE_CTL+8)  /* Takes 3 ints */
+#define IP_FW_CREATECHAIN	(IP_FW_BASE_CTL+9)  /* Takes ip_chainlabel */
+#define IP_FW_DELETECHAIN	(IP_FW_BASE_CTL+10) /* Takes ip_chainlabel */
+#define IP_FW_POLICY		(IP_FW_BASE_CTL+11) /* Takes ip_fwpolicy */
+/* Masquerade control, only 1 optname */
+
+#define IP_FW_MASQ_CTL  	(IP_FW_BASE_CTL+12) /* General ip_masq ctl */
+
+/* Builtin chain labels */
+#define IP_FW_LABEL_FORWARD	"forward"
+#define IP_FW_LABEL_INPUT	"input"
+#define IP_FW_LABEL_OUTPUT	"output"
+
+/* Special targets */
+#define IP_FW_LABEL_MASQUERADE  "MASQ"
+#define IP_FW_LABEL_REDIRECT    "REDIRECT"
+#define IP_FW_LABEL_ACCEPT	"ACCEPT"
+#define IP_FW_LABEL_BLOCK	"DENY"
+#define IP_FW_LABEL_REJECT	"REJECT"
+#define IP_FW_LABEL_RETURN	"RETURN"
+#define IP_FW_LABEL_QUEUE       "QUEUE"
+
+/* Files in /proc/net */
+#define IP_FW_PROC_CHAINS	"ip_fwchains"
+#define IP_FW_PROC_CHAIN_NAMES	"ip_fwnames"
+
+
+struct ip_fwpkt
+{
+	struct iphdr fwp_iph;			/* IP header */
+	union {
+		struct tcphdr fwp_tcph;		/* TCP header or */
+		struct udphdr fwp_udph;		/* UDP header */
+		struct icmphdr fwp_icmph;	/* ICMP header */
+	} fwp_protoh;
+	struct in_addr fwp_via;			/* interface address */
+	char           fwp_vianame[IFNAMSIZ];	/* interface name */
+};
+
+/* The argument to IP_FW_DELETE and IP_FW_APPEND */
+struct ip_fwchange
+{
+	struct ip_fwuser fwc_rule;
+	ip_chainlabel fwc_label;
+};	
+
+/* The argument to IP_FW_CHECK. */
+struct ip_fwtest
+{
+	struct ip_fwpkt fwt_packet; /* Packet to be tested */
+	ip_chainlabel fwt_label;   /* Block to start test in */
+};
+						
+/* The argument to IP_FW_DELETE_NUM */
+struct ip_fwdelnum
+{
+	__u32 fwd_rulenum;
+	ip_chainlabel fwd_label;
+};
+
+/* The argument to IP_FW_REPLACE and IP_FW_INSERT */
+struct ip_fwnew
+{
+	__u32 fwn_rulenum;
+	struct ip_fwuser fwn_rule;
+	ip_chainlabel fwn_label;
+};
+
+/* The argument to IP_FW_POLICY */
+struct ip_fwpolicy
+{
+	ip_chainlabel fwp_policy;
+	ip_chainlabel fwp_label;
+};
+/*
+ * timeouts for ip masquerading
+ */
+
+extern int ip_fw_masq_timeouts(void *, int);
+
+
+/*
+ *	Main firewall chains definitions and global var's definitions.
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0)
+#include <linux/init.h>
+extern void ip_fw_init(void) __init;
+#else /* 2.0.x */
+extern void ip_fw_init(void);
+#endif /* 2.1.x */
+extern int ip_fw_ctl(int, void *, int);
+#ifdef CONFIG_IP_MASQUERADE
+extern int ip_masq_uctl(int, char *, int);
+#endif
+#endif /* KERNEL */
+
+#endif /* _IP_FWCHAINS_H */