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117 lines
4.4 KiB
Diff
117 lines
4.4 KiB
Diff
From 20c706d4cba3227c9c44fb61c4d93b0ae84e1464 Mon Sep 17 00:00:00 2001
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From: Tim Gardner <tim.gardner@canonical.com>
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Date: Mon, 1 Mar 2010 19:00:29 -0700
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Subject: [PATCH] xt_recent: Added XT_RECENT_REAP logic and man page documentation
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Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
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---
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extensions/libxt_recent.c | 20 ++++++++++++++++++++
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extensions/libxt_recent.man | 5 +++++
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include/linux/netfilter/xt_recent.h | 7 +++++++
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3 files changed, 32 insertions(+), 0 deletions(-)
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--- a/extensions/libxt_recent.c
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+++ b/extensions/libxt_recent.c
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@@ -20,6 +20,7 @@ static const struct option recent_opts[]
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{.name = "name", .has_arg = true, .val = 208},
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{.name = "rsource", .has_arg = false, .val = 209},
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{.name = "rdest", .has_arg = false, .val = 210},
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+ {.name = "reap", .has_arg = false, .val = 211},
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XT_GETOPT_TABLEEND,
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};
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@@ -37,6 +38,7 @@ static void recent_help(void)
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" --hitcount hits For check and update commands above.\n"
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" Specifies that the match will only occur if source address seen hits times.\n"
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" May be used in conjunction with the seconds option.\n"
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+" --reap Remove entries that have expired. Can only be used with --seconds\n"
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" --rttl For check and update commands above.\n"
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" Specifies that the match will only occur if the source address and the TTL\n"
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" match between this packet and the one which was set.\n"
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@@ -63,6 +65,8 @@ static void recent_init(struct xt_entry_
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(XT_RECENT_SET | XT_RECENT_CHECK | \
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XT_RECENT_UPDATE | XT_RECENT_REMOVE)
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+#define XT_RECENT_SECONDS 1 << 31
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+
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static int recent_parse(int c, char **argv, int invert, unsigned int *flags,
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const void *entry, struct xt_entry_match **match)
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{
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@@ -104,6 +108,7 @@ static int recent_parse(int c, char **ar
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case 204:
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info->seconds = atoi(optarg);
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+ *flags |= XT_RECENT_SECONDS;
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break;
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case 205:
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@@ -139,6 +144,11 @@ static int recent_parse(int c, char **ar
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info->side = XT_RECENT_DEST;
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break;
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+ case 211:
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+ info->check_set |= XT_RECENT_REAP;
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+ *flags |= XT_RECENT_REAP;
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+ break;
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+
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default:
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return 0;
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}
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@@ -157,6 +167,12 @@ static void recent_check(unsigned int fl
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xtables_error(PARAMETER_PROBLEM,
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"recent: --rttl may only be used with --rcheck or "
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"--update");
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+ if ((flags & XT_RECENT_REAP) &&
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+ ((flags & (XT_RECENT_SET | XT_RECENT_REMOVE)) ||
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+ (!(flags & XT_RECENT_SECONDS))))
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+ xtables_error(PARAMETER_PROBLEM,
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+ "recent: --reap may only be used with --rcheck or "
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+ "--update and --seconds");
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}
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static void recent_print(const void *ip, const struct xt_entry_match *match,
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@@ -185,6 +201,8 @@ static void recent_print(const void *ip,
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printf("side: source ");
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if (info->side == XT_RECENT_DEST)
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printf("side: dest ");
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+ if (info->check_set & XT_RECENT_REAP)
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+ printf("reap ");
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}
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static void recent_save(const void *ip, const struct xt_entry_match *match)
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@@ -211,6 +229,8 @@ static void recent_save(const void *ip,
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printf("--rsource ");
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if (info->side == XT_RECENT_DEST)
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printf("--rdest ");
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+ if (info->check_set & XT_RECENT_REAP)
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+ printf("--reap ");
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}
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static struct xtables_match recent_mt_reg = {
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--- a/extensions/libxt_recent.man
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+++ b/extensions/libxt_recent.man
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@@ -41,6 +41,11 @@ This option must be used in conjunction
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\fB\-\-update\fP. When used, this will narrow the match to only happen when the
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address is in the list and was seen within the last given number of seconds.
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.TP
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+\fB\-\-reap\fP \fIreap\fP
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+This option must be used in conjunction with \fB\-\-seconds\fP. When used, this
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+will remove entries with the most recent timestamp older then \fB\-\-seconds\fP
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+since the last packet was received.
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+.TP
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\fB\-\-hitcount\fP \fIhits\fP
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This option must be used in conjunction with one of \fB\-\-rcheck\fP or
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\fB\-\-update\fP. When used, this will narrow the match to only happen when the
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--- a/include/linux/netfilter/xt_recent.h
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+++ b/include/linux/netfilter/xt_recent.h
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@@ -23,6 +23,9 @@ enum {
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#define XT_RECENT_VALID_FLAGS (XT_RECENT_CHECK|XT_RECENT_SET|XT_RECENT_UPDATE|\
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XT_RECENT_REMOVE|XT_RECENT_TTL|XT_RECENT_REAP)
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+/* Only allowed with --rcheck and --update */
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+#define XT_RECENT_MODIFIERS (XT_RECENT_TTL|XT_RECENT_REAP)
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+
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struct xt_recent_mtinfo {
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__u32 seconds;
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__u32 hit_count;
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