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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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1
include/uapi/linux/netfilter/nfnetlink_conntrack.h
View File

@ -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)

1
net/netfilter/nf_conntrack_core.c
View File

@ -186,6 +186,7 @@ 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;

3
net/netfilter/nf_conntrack_netlink.c
View File

@ -2205,6 +2205,9 @@ 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;