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.four...@wifirst.fr>
---
include/uapi/linux/netfilter/nfnetlink_conntrack.h | 1 +
net/netfilter/nf_conntrack_core.c | 1 +
net/netfilter/nf_conntrack_netlink.c | 3 +++
3 files changed, 5 insertions(+)
diff --git a/include/uapi/linux/netfilter/nfnetlink_conntrack.h
b/include/uapi/linux/netfilter/nfnetlink_conntrack.h
index 7397e022ce6e..619121b7fc85 100644
--- a/include/uapi/linux/netfilter/nfnetlink_conntrack.h
+++ b/include/uapi/linux/netfilter/nfnetlink_conntrack.h
@@ -252,6 +252,7 @@ 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)
diff --git a/net/netfilter/nf_conntrack_core.c
b/net/netfilter/nf_conntrack_core.c
index 85f643c1e227..c23d9cb9eb1a 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -188,6 +188,7 @@ unsigned int nf_conntrack_htable_size __read_mostly;
EXPORT_SYMBOL_GPL(nf_conntrack_htable_size);
unsigned int nf_conntrack_max __read_mostly;
+EXPORT_SYMBOL_GPL(nf_conntrack_max);
seqcount_t nf_conntrack_generation __read_mostly;
static unsigned int nf_conntrack_hash_rnd __read_mostly;
diff --git a/net/netfilter/nf_conntrack_netlink.c
b/net/netfilter/nf_conntrack_netlink.c
index 382d49792f42..4645fee2b75d 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -2117,6 +2117,9 @@ ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32
portid, u32 seq, u32 type,
if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
goto nla_put_failure;
+ if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES,
htonl(nf_conntrack_max)))
+ goto nla_put_failure;
+
nlmsg_end(skb, nlh);
return skb->len;
--
2.11.0
--
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