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netfilter: xt_recent: Lift restrictions on max hitcount value

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Support tracking of up to 65535 packets per table entry instead of just
255 to better facilitate longer term tracking or higher throughput
scenarios.

Note how this aligns sizes of struct recent_entry's 'nstamps' and
'index' fields when 'nstamps' was larger before. This is unnecessary as
the value of 'nstamps' grows along with that of 'index' after being
initialized to 1 (see recent_entry_update()). Its value will thus never
exceed that of 'index' and therefore does not need to provide space for
larger values.

Requested-by: Fabio <pedretti.fabio@gmail.com>
Link: https://bugzilla.netfilter.org/show_bug.cgi?id=1745
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2024-06-27 00:35:05 +02:00 committed by Pablo Neira Ayuso
parent 742ad979f5
commit f4ebd03496
1 changed files with 4 additions and 4 deletions
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8
net/netfilter/xt_recent.c
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@ -59,9 +59,9 @@ MODULE_PARM_DESC(ip_list_gid, "default owning group of /proc/net/xt_recent/* fil
/* retained for backwards compatibility */
static unsigned int ip_pkt_list_tot __read_mostly;
module_param(ip_pkt_list_tot, uint, 0400);
MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)");
MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 65535)");
#define XT_RECENT_MAX_NSTAMPS 256
#define XT_RECENT_MAX_NSTAMPS 65536
struct recent_entry {
struct list_head list;
@ -69,7 +69,7 @@ struct recent_entry {
union nf_inet_addr addr;
u_int16_t family;
u_int8_t ttl;
u_int8_t index;
u_int16_t index;
u_int16_t nstamps;
unsigned long stamps[];
};
@ -80,7 +80,7 @@ struct recent_table {
union nf_inet_addr mask;
unsigned int refcnt;
unsigned int entries;
u8 nstamps_max_mask;
u_int16_t nstamps_max_mask;
struct list_head lru_list;
struct list_head iphash[];
};