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@xxxxxxxxx> Link: https://bugzilla.netfilter.org/show_bug.cgi?id=1745 Signed-off-by: Phil Sutter <phil@xxxxxx> --- Changes since v1: - Fold the educational first patch into the actual change, keeping the commit's rationale on correctness. --- net/netfilter/xt_recent.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c index ef93e0d3bee0..588a5e6ad899 100644 --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -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[]; }; -- 2.43.0
