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netfilter: xtables: avoid pointer to self

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Commit 784544739a (netfilter: iptables:
lock free counters) broke a number of modules whose rule data referenced
itself. A reallocation would not reestablish the correct references, so
it is best to use a separate struct that does not fall under RCU.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Jan Engelhardt 2009-03-16 15:35:29 +01:00 • committed by Patrick McHardy
commit acc738fec0
6 changed files with 88 additions and 31 deletions
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9
include/linux/netfilter/xt_limit.h
View file

@ -4,6 +4,8 @@
/* timings are in milliseconds. */
#define XT_LIMIT_SCALE 10000
struct xt_limit_priv;
/* 1/10,000 sec period => max of 10,000/sec. Min rate is then 429490
seconds, or one every 59 hours. */
struct xt_rateinfo {
@ -11,11 +13,10 @@ struct xt_rateinfo {
u_int32_t burst; /* Period multiplier for upper limit. */
/* Used internally by the kernel */
unsigned long prev;
u_int32_t credit;
unsigned long prev; /* moved to xt_limit_priv */
u_int32_t credit; /* moved to xt_limit_priv */
u_int32_t credit_cap, cost;
/* Ugly, ugly fucker. */
struct xt_rateinfo *master;
struct xt_limit_priv *master;
};
#endif /*_XT_RATE_H*/

4
include/linux/netfilter/xt_quota.h
View file

@ -6,13 +6,15 @@ enum xt_quota_flags {
};
#define XT_QUOTA_MASK 0x1
struct xt_quota_priv;
struct xt_quota_info {
u_int32_t flags;
u_int32_t pad;
/* Used internally by the kernel */
aligned_u64 quota;
struct xt_quota_info *master;
struct xt_quota_priv *master;
};
#endif /* _XT_QUOTA_H */

7
include/linux/netfilter/xt_statistic.h
View file

@ -13,6 +13,8 @@ enum xt_statistic_flags {
};
#define XT_STATISTIC_MASK 0x1
struct xt_statistic_priv;
struct xt_statistic_info {
u_int16_t mode;
u_int16_t flags;
@ -23,11 +25,10 @@ struct xt_statistic_info {
struct {
u_int32_t every;
u_int32_t packet;
/* Used internally by the kernel */
u_int32_t count;
u_int32_t count; /* unused */
} nth;
} u;
struct xt_statistic_info *master __attribute__((aligned(8)));
struct xt_statistic_priv *master __attribute__((aligned(8)));
};
#endif /* _XT_STATISTIC_H */