iptables: add support for ipt_recent --reap option

SVN-Revision: 26008

package/iptables/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2006-2010 OpenWrt.org
+# Copyright (C) 2006-2011 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=iptables
 PKG_VERSION:=1.4.10
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_MD5SUM:=f382fe693f0b59d87bd47bea65eca198
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2

package/iptables/patches/011-recent-add-reap.patch

@@ -0,0 +1,122 @@
+From 20c706d4cba3227c9c44fb61c4d93b0ae84e1464 Mon Sep 17 00:00:00 2001
+From: Tim Gardner <tim.gardner@canonical.com>
+Date: Mon, 1 Mar 2010 19:00:29 -0700
+Subject: [PATCH] xt_recent: Added XT_RECENT_REAP logic and man page documentation
+
+Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
+---
+ extensions/libxt_recent.c           |   20 ++++++++++++++++++++
+ extensions/libxt_recent.man         |    5 +++++
+ include/linux/netfilter/xt_recent.h |    7 +++++++
+ 3 files changed, 32 insertions(+), 0 deletions(-)
+
+diff --git a/extensions/libxt_recent.c b/extensions/libxt_recent.c
+index 4ac32f7..7e3d280 100644
+--- a/extensions/libxt_recent.c
++++ b/extensions/libxt_recent.c
+@@ -20,6 +20,7 @@ static const struct option recent_opts[] = {
+ 	{.name = "name",     .has_arg = true,  .val = 208},
+ 	{.name = "rsource",  .has_arg = false, .val = 209},
+ 	{.name = "rdest",    .has_arg = false, .val = 210},
++	{.name = "reap",     .has_arg = false, .val = 211},
+ 	XT_GETOPT_TABLEEND,
+ };
+ 
+@@ -36,6 +37,7 @@ static void recent_help(void)
+ "    --hitcount hits             For check and update commands above.\n"
+ "                                Specifies that the match will only occur if source address seen hits times.\n"
+ "                                May be used in conjunction with the seconds option.\n"
++"    --reap                      Remove entries that have expired. Can only be used with --seconds\n"
+ "    --rttl                      For check and update commands above.\n"
+ "                                Specifies that the match will only occur if the source address and the TTL\n"
+ "                                match between this packet and the one which was set.\n"
+@@ -62,6 +64,8 @@ static void recent_init(struct xt_entry_match *match)
+ 	(XT_RECENT_SET | XT_RECENT_CHECK | \
+ 	XT_RECENT_UPDATE | XT_RECENT_REMOVE)
+ 
++#define XT_RECENT_SECONDS 1 << 31
++
+ static int recent_parse(int c, char **argv, int invert, unsigned int *flags,
+                         const void *entry, struct xt_entry_match **match)
+ {
+@@ -103,6 +107,7 @@ static int recent_parse(int c, char **argv, int invert, unsigned int *flags,
+ 
+ 		case 204:
+ 			info->seconds = atoi(optarg);
++			*flags |= XT_RECENT_SECONDS;
+ 			break;
+ 
+ 		case 205:
+@@ -138,6 +143,11 @@ static int recent_parse(int c, char **argv, int invert, unsigned int *flags,
+ 			info->side = XT_RECENT_DEST;
+ 			break;
+ 
++		case 211:
++			info->check_set |= XT_RECENT_REAP;
++			*flags |= XT_RECENT_REAP;
++			break;
++
+ 		default:
+ 			return 0;
+ 	}
+@@ -156,6 +166,12 @@ static void recent_check(unsigned int flags)
+ 		xtables_error(PARAMETER_PROBLEM,
+ 		           "recent: --rttl may only be used with --rcheck or "
+ 		           "--update");
++	if ((flags & XT_RECENT_REAP) &&
++	    ((flags & (XT_RECENT_SET | XT_RECENT_REMOVE)) ||
++	    (!(flags & XT_RECENT_SECONDS))))
++		xtables_error(PARAMETER_PROBLEM,
++		           "recent: --reap may only be used with --rcheck or "
++		           "--update and --seconds");
+ }
+ 
+ static void recent_print(const void *ip, const struct xt_entry_match *match,
+@@ -185,6 +201,8 @@
+ 		printf("side: source ");
+ 	if (info->side == XT_RECENT_DEST)
+ 		printf("side: dest ");
++	if (info->check_set & XT_RECENT_REAP)
++		printf("reap ");
+ }
+ 
+ static void recent_save(const void *ip, const struct xt_entry_match *match)
+@@ -210,6 +228,8 @@ static void recent_save(const void *ip, const struct xt_entry_match *match)
+ 		printf("--rsource ");
+ 	if (info->side == XT_RECENT_DEST)
+ 		printf("--rdest ");
++	if (info->check_set & XT_RECENT_REAP)
++		printf("--reap ");
+ }
+ 
+ static struct xtables_match recent_mt_reg = {
+diff --git a/extensions/libxt_recent.man b/extensions/libxt_recent.man
+index 532c328..26e4fb9 100644
+--- a/extensions/libxt_recent.man
++++ b/extensions/libxt_recent.man
+@@ -41,6 +41,11 @@ This option must be used in conjunction with one of \fB\-\-rcheck\fP or
+ \fB\-\-update\fP. When used, this will narrow the match to only happen when the
+ address is in the list and was seen within the last given number of seconds.
+ .TP
++\fB\-\-reap\fP \fIreap\fP
++This option must be used in conjunction with \fB\-\-seconds\fP. When used, this
++will remove entries with the most recent timestamp older then \fB\-\-seconds\fP
++since the last packet was received.
++.TP
+ \fB\-\-hitcount\fP \fIhits\fP
+ This option must be used in conjunction with one of \fB\-\-rcheck\fP or
+ \fB\-\-update\fP. When used, this will narrow the match to only happen when the
+diff --git a/include/linux/netfilter/xt_recent.h b/include/linux/netfilter/xt_recent.h
+index d2c2766..e21acdf 100644
+--- a/include/linux/netfilter/xt_recent.h
++++ b/include/linux/netfilter/xt_recent.h
+@@ -16,6 +17,9 @@ enum {
+ 	XT_RECENT_NAME_LEN = 200,
+ };
+ 
++/* Only allowed with --rcheck and --update */
++#define XT_RECENT_MODIFIERS (XT_RECENT_TTL|XT_RECENT_REAP)
++
+ struct xt_recent_mtinfo {
+ 	__u32 seconds;
+ 	__u32 hit_count;