Âbackport upstream commit 0079c5aee34880bcee7feee9960f0502c73dc5fa (xt_recent entry reaper) to kernels 2.6.30, 2.6.31, 2.6.32 and 2.6.34

SVN-Revision: 26007

1 files changed, 71 insertions, 0 deletions

diff --git a/target/linux/generic/patches-2.6.31/120-netfilter_recent_reap.patch b/target/linux/generic/patches-2.6.31/120-netfilter_recent_reap.patch
new file mode 100644
index 0000000000..8ac3954470
--- /dev/null
+++ b/target/linux/generic/patches-2.6.31/120-netfilter_recent_reap.patch
@@ -0,0 +1,71 @@
+--- a/include/linux/netfilter/xt_recent.h
++++ b/include/linux/netfilter/xt_recent.h
+@@ -9,6 +9,7 @@ enum {
+ 	XT_RECENT_UPDATE   = 1 << 2,
+ 	XT_RECENT_REMOVE   = 1 << 3,
+ 	XT_RECENT_TTL      = 1 << 4,
++	XT_RECENT_REAP     = 1 << 5,
+ 
+ 	XT_RECENT_SOURCE   = 0,
+ 	XT_RECENT_DEST     = 1,
+@@ -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;
+--- a/net/netfilter/xt_recent.c
++++ b/net/netfilter/xt_recent.c
+@@ -142,6 +142,25 @@ static void recent_entry_remove(struct r
+ 	t->entries--;
+ }
+ 
++/*
++ * Drop entries with timestamps older then 'time'.
++ */
++static void recent_entry_reap(struct recent_table *t, unsigned long time)
++{
++	struct recent_entry *e;
++
++	/*
++	 * The head of the LRU list is always the oldest entry.
++	 */
++	e = list_entry(t->lru_list.next, struct recent_entry, lru_list);
++
++	/*
++	 * The last time stamp is the most recent.
++	 */
++	if (time_after(time, e->stamps[e->index-1]))
++		recent_entry_remove(t, e);
++}
++
+ static struct recent_entry *
+ recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr,
+ 		  u_int16_t family, u_int8_t ttl)
+@@ -265,6 +284,10 @@ recent_mt(const struct sk_buff *skb, con
+ 				break;
+ 			}
+ 		}
++
++		/* info->seconds must be non-zero */
++		if (info->check_set & XT_RECENT_REAP)
++			recent_entry_reap(t, time);
+ 	}
+ 
+ 	if (info->check_set & XT_RECENT_SET ||
+@@ -292,7 +315,10 @@ static bool recent_mt_check(const struct
+ 		      XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1)
+ 		return false;
+ 	if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) &&
+-	    (info->seconds || info->hit_count))
++	    (info->seconds || info->hit_count ||
++	    (info->check_set & XT_RECENT_MODIFIERS)))
++		return false;
++	if ((info->check_set & XT_RECENT_REAP) && !info->seconds)
+ 		return false;
+ 	if (info->hit_count > ip_pkt_list_tot)
+ 		return false;