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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2016-09-20 16:17:22 +0200
committerDavid S. Miller <davem@davemloft.net>2016-09-21 00:58:23 -0400
commitb5036cd4ed3173ab8cdbc85e2ba74acf46bafb51 (patch)
treed56ab33c889d5c3276af636ae6c6c4c8031fc526 /net/ipv4/ipmr.c
parent493d5f6db0ab12a9fcac587ae223f3e4e48dba6f (diff)
downloadlinux-b5036cd4ed3173ab8cdbc85e2ba74acf46bafb51.tar.bz2
ipmr, ip6mr: return lastuse relative to now
When I introduced the lastuse member I made a subtle error because it was returned as an absolute value but that is meaningless to user-space as it doesn't allow to see how old exactly an entry is. Let's make it similar to how the bridge returns such values and make it relative to "now" (jiffies). This allows us to show the actual age of the entries and is much more useful (e.g. user-space daemons can age out entries, iproute2 can display the lastuse properly). Fixes: 43b9e1274060 ("net: ipmr/ip6mr: add support for keeping an entry age") Reported-by: Satish Ashok <sashok@cumulusnetworks.com> Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ipmr.c')
-rw-r--r--net/ipv4/ipmr.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 26253328d227..a87bcd2d4a94 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2076,6 +2076,7 @@ static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
struct rta_mfc_stats mfcs;
struct nlattr *mp_attr;
struct rtnexthop *nhp;
+ unsigned long lastuse;
int ct;
/* If cache is unresolved, don't try to parse IIF and OIF */
@@ -2105,12 +2106,14 @@ static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
nla_nest_end(skb, mp_attr);
+ lastuse = READ_ONCE(c->mfc_un.res.lastuse);
+ lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0;
+
mfcs.mfcs_packets = c->mfc_un.res.pkt;
mfcs.mfcs_bytes = c->mfc_un.res.bytes;
mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) ||
- nla_put_u64_64bit(skb, RTA_EXPIRES,
- jiffies_to_clock_t(c->mfc_un.res.lastuse),
+ nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse),
RTA_PAD))
return -EMSGSIZE;