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netfilter: ctnetlink: export nf_conntrack_max

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IPCTNL_MSG_CT_GET_STATS netlink command allow to monitor current number
of conntrack entries. However, if one wants to compare it with the
maximum (and detect exhaustion), the only solution is currently to read
sysctl value.

This patch add nf_conntrack_max value in netlink message, and simplify
monitoring for application built on netlink API.

Signed-off-by: Florent Fourcot <florent.fourcot@wifirst.fr>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florent Fourcot
2018-05-06 16:30:14 +02:00
committed by Pablo Neira Ayuso
parent bfb15f2a95
commit 538c5672be
3 changed files with 5 additions and 0 deletions
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include/uapi/linux/netfilter/nfnetlink_conntrack.h
+1
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@@ -262,6 +262,7 @@ enum ctattr_stats_cpu {
enum ctattr_stats_global {
CTA_STATS_GLOBAL_UNSPEC,
CTA_STATS_GLOBAL_ENTRIES,
CTA_STATS_GLOBAL_MAX_ENTRIES,
__CTA_STATS_GLOBAL_MAX,
};
#define CTA_STATS_GLOBAL_MAX (__CTA_STATS_GLOBAL_MAX - 1)