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Message-Id: <20081027045421.C6B85C6408E@host1.ystp.ac.ir>
Date: Mon, 27 Oct 2008 08:24:21 +0330 (IRST)
From: hamid.jafarian@...il.com (hamid jafarian)
to: Netfilter-devel <netfilter-devel@...r.kernel.org>
cc: Amin Azez <azez@...mechanic.net>
subject: [PATCH 06/09]IPtablestng/KernelSpace - patch ip_tables.h
eliminating unnecessary definitions and adopting to new features.
by this patch, ip_tables.h will caontain the necessary definitions that are required by iptablestng to implement ipv4 tables.
diff --git a/include/linux/netfilter_ipv4/ip_tables.h b/include/linux/netfilter_ipv4/ip_tables.h
index bfc889f..f133037 100644
--- a/include/linux/netfilter_ipv4/ip_tables.h
+++ b/include/linux/netfilter_ipv4/ip_tables.h
@@ -1,15 +1,6 @@
-/*
- * 25-Jul-1998 Major changes to allow for ip chain table
- *
- * 3-Jan-2000 Named tables to allow packet selection for different uses.
- */
-
-/*
- * Format of an IP firewall descriptor
+/* Packet Tables Code - IP4 part
*
- * 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.
+ * Copyright (C) 2005-2008 Hamid Jafarian(hm.t.) <hamid.jafarian@...il.com>
*/
#ifndef _IPTABLES_H
@@ -21,8 +12,9 @@
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
-#endif
#include <linux/compiler.h>
+#endif
+
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
@@ -51,12 +43,13 @@ struct ipt_ip {
/* Inverse flags */
u_int8_t invflags;
};
+#include <linux/netfilter/pkt_tables.h>
#define ipt_entry_match xt_entry_match
#define ipt_entry_target xt_entry_target
#define ipt_standard_target xt_standard_target
-#define ipt_counters xt_counters
+#define ipt_counters pktt_counters
/* Values for "flag" field in struct ipt_ip (general ip structure). */
#define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
@@ -73,30 +66,24 @@ struct ipt_ip {
#define IPT_INV_PROTO XT_INV_PROTO
#define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
-/* This structure defines each of the firewall rules. Consists of 3
- parts which are 1) general IP header stuff 2) match specific
- stuff 3) the target to perform if the rule matches */
-struct ipt_entry
-{
- struct ipt_ip ip;
-
- /* Mark with fields that we care about. */
- unsigned int nfcache;
+#define ipt_entry pktt_entry
- /* Size of ipt_entry + matches */
- u_int16_t target_offset;
- /* Size of ipt_entry + matches + target */
- u_int16_t next_offset;
+#define IP4_SRCIP(skb) (ip_hdr(skb)->saddr)
+#define IP4_DSTIP(skb) (ip_hdr(skb)->daddr)
+#define IP4_PROTO(skb) (ip_hdr(skb)->protocol)
- /* Back pointer */
- unsigned int comefrom;
+#define IP4_TOTLEN(skb)(ntohs(ip_hdr(skb)->tot_len))
+#define IP4_PROTOFF(skb)(ip_hdr(skb)->ihl * 4)
+#define IP4_OFFSET(skb) (ntohs(ip_hdr(skb)->frag_off) & IP_OFFSET)
- /* Packet and byte counters. */
- struct xt_counters counters;
-
- /* The matches (if any), then the target. */
- unsigned char elems[0];
-};
+#define IP4_CHECK_FRAGMENT(ip, offset) \
+({ \
+ int __ret = 0; \
+ if( (( (ip).flags & IPT_F_FRAG ) && !offset) /*he can't match*/ \
+ /* but if INV */ ^ !!((ip).invflags & IPT_INV_FRAG) ) \
+ __ret = NF_MAX_VERDICT +2; \
+ __ret; \
+})
/*
* New IP firewall options for [gs]etsockopt at the RAW IP level.
@@ -117,8 +104,8 @@ struct ipt_entry
#define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3)
#define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET
-#define IPT_CONTINUE XT_CONTINUE
-#define IPT_RETURN XT_RETURN
+#define IPT_CONTINUE PKTT_CONTINUE
+#define IPT_RETURN PKTT_RETURN
#include <linux/netfilter/xt_tcpudp.h>
#define ipt_udp xt_udp
@@ -145,96 +132,19 @@ struct ipt_icmp
/* Values for "inv" field for struct ipt_icmp. */
#define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
-/* The argument to IPT_SO_GET_INFO */
-struct ipt_getinfo
-{
- /* Which table: caller fills this in. */
- char name[IPT_TABLE_MAXNAMELEN];
-
- /* Kernel fills these in. */
- /* Which hook entry points are valid: bitmask */
- unsigned int valid_hooks;
-
- /* Hook entry points: one per netfilter hook. */
- unsigned int hook_entry[NF_INET_NUMHOOKS];
-
- /* Underflow points. */
- unsigned int underflow[NF_INET_NUMHOOKS];
-
- /* Number of entries */
- unsigned int num_entries;
-
- /* Size of entries. */
- unsigned int size;
-};
-
-/* The argument to IPT_SO_SET_REPLACE. */
-struct ipt_replace
-{
- /* Which table. */
- char name[IPT_TABLE_MAXNAMELEN];
-
- /* Which hook entry points are valid: bitmask. You can't
- change this. */
- unsigned int valid_hooks;
-
- /* Number of entries */
- unsigned int num_entries;
-
- /* Total size of new entries */
- unsigned int size;
-
- /* Hook entry points. */
- unsigned int hook_entry[NF_INET_NUMHOOKS];
-
- /* Underflow points. */
- unsigned int underflow[NF_INET_NUMHOOKS];
-
- /* Information about old entries: */
- /* Number of counters (must be equal to current number of entries). */
- unsigned int num_counters;
- /* The old entries' counters. */
- struct xt_counters __user *counters;
-
- /* The entries (hang off end: not really an array). */
- struct ipt_entry entries[0];
-};
-
/* The argument to IPT_SO_ADD_COUNTERS. */
#define ipt_counters_info xt_counters_info
-/* The argument to IPT_SO_GET_ENTRIES. */
-struct ipt_get_entries
-{
- /* Which table: user fills this in. */
- char name[IPT_TABLE_MAXNAMELEN];
-
- /* User fills this in: total entry size. */
- unsigned int size;
-
- /* The entries. */
- struct ipt_entry entrytable[0];
-};
-
/* Standard return verdict, or do jump. */
#define IPT_STANDARD_TARGET XT_STANDARD_TARGET
/* Error verdict. */
#define IPT_ERROR_TARGET XT_ERROR_TARGET
/* Helper functions */
-static __inline__ struct ipt_entry_target *
-ipt_get_target(struct ipt_entry *e)
-{
- return (void *)e + e->target_offset;
-}
+#define ipt_get_target(e) pktt_entry_get_target(e)
-/* fn returns 0 to continue iteration */
-#define IPT_MATCH_ITERATE(e, fn, args...) \
- XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
-
-/* fn returns 0 to continue iteration */
-#define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
- XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
+#define IPT_MATCH_ITERATE(e, fn, args...) \
+ PKTT_ENTRY_MATCH_ITERATE(e, fn, ## args)
/*
* Main firewall chains definitions and global var's definitions.
@@ -244,96 +154,7 @@ ipt_get_target(struct ipt_entry *e)
#include <linux/init.h>
extern void ipt_init(void) __init;
-extern struct xt_table *ipt_register_table(struct net *net,
- struct xt_table *table,
- const struct ipt_replace *repl);
-extern void ipt_unregister_table(struct xt_table *table);
-
-/* Standard entry. */
-struct ipt_standard
-{
- struct ipt_entry entry;
- struct ipt_standard_target target;
-};
-
-struct ipt_error_target
-{
- struct ipt_entry_target target;
- char errorname[IPT_FUNCTION_MAXNAMELEN];
-};
-
-struct ipt_error
-{
- struct ipt_entry entry;
- struct ipt_error_target target;
-};
-
-#define IPT_ENTRY_INIT(__size) \
-{ \
- .target_offset = sizeof(struct ipt_entry), \
- .next_offset = (__size), \
-}
-
-#define IPT_STANDARD_INIT(__verdict) \
-{ \
- .entry = IPT_ENTRY_INIT(sizeof(struct ipt_standard)), \
- .target = XT_TARGET_INIT(IPT_STANDARD_TARGET, \
- sizeof(struct xt_standard_target)), \
- .target.verdict = -(__verdict) - 1, \
-}
-
-#define IPT_ERROR_INIT \
-{ \
- .entry = IPT_ENTRY_INIT(sizeof(struct ipt_error)), \
- .target = XT_TARGET_INIT(IPT_ERROR_TARGET, \
- sizeof(struct ipt_error_target)), \
- .target.errorname = "ERROR", \
-}
-
-extern unsigned int ipt_do_table(struct sk_buff *skb,
- unsigned int hook,
- const struct net_device *in,
- const struct net_device *out,
- struct xt_table *table);
-
#define IPT_ALIGN(s) XT_ALIGN(s)
-#ifdef CONFIG_COMPAT
-#include <net/compat.h>
-
-struct compat_ipt_entry
-{
- struct ipt_ip ip;
- compat_uint_t nfcache;
- u_int16_t target_offset;
- u_int16_t next_offset;
- compat_uint_t comefrom;
- struct compat_xt_counters counters;
- unsigned char elems[0];
-};
-
-/* Helper functions */
-static inline struct ipt_entry_target *
-compat_ipt_get_target(struct compat_ipt_entry *e)
-{
- return (void *)e + e->target_offset;
-}
-
-#define COMPAT_IPT_ALIGN(s) COMPAT_XT_ALIGN(s)
-
-/* fn returns 0 to continue iteration */
-#define COMPAT_IPT_MATCH_ITERATE(e, fn, args...) \
- XT_MATCH_ITERATE(struct compat_ipt_entry, e, fn, ## args)
-
-/* fn returns 0 to continue iteration */
-#define COMPAT_IPT_ENTRY_ITERATE(entries, size, fn, args...) \
- XT_ENTRY_ITERATE(struct compat_ipt_entry, entries, size, fn, ## args)
-
-/* fn returns 0 to continue iteration */
-#define COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entries, size, n, fn, args...) \
- XT_ENTRY_ITERATE_CONTINUE(struct compat_ipt_entry, entries, size, n, \
- fn, ## args)
-
-#endif /* CONFIG_COMPAT */
#endif /*__KERNEL__*/
#endif /* _IPTABLES_H */
--
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