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netfilter: nft_ct: fix expiration getter

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We need to compute timeout.expires - jiffies, not the other way around.
Add a helper, another patch can then later change more places in
conntrack code where we currently open-code this.

Will allow us to only change one place later when we remove per-ct timer.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-07-06 14:53:06 +02:00 committed by Pablo Neira Ayuso
parent 9cc1c73ad6
commit c8607e0200
2 changed files with 9 additions and 5 deletions
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8
include/net/netfilter/nf_conntrack.h
View File

@ -284,6 +284,14 @@ static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
}
/* jiffies until ct expires, 0 if already expired */
static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
{
long timeout = (long)ct->timeout.expires - (long)jiffies;
return timeout > 0 ? timeout : 0;
}
struct kernel_param;
int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);

6
net/netfilter/nft_ct.c
View File

@ -54,7 +54,6 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
const struct nf_conn_help *help;
const struct nf_conntrack_tuple *tuple;
const struct nf_conntrack_helper *helper;
long diff;
unsigned int state;
ct = nf_ct_get(pkt->skb, &ctinfo);
@ -94,10 +93,7 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
return;
#endif
case NFT_CT_EXPIRATION:
diff = (long)jiffies - (long)ct->timeout.expires;
if (diff < 0)
diff = 0;
*dest = jiffies_to_msecs(diff);
*dest = jiffies_to_msecs(nf_ct_expires(ct));
return;
case NFT_CT_HELPER:
if (ct->master == NULL)