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>

1 files changed, 5 insertions, 2 deletions

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 6122f9c5cc49..fccb5dd91902 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -2239,6 +2239,7 @@ static int __ip6mr_fill_mroute(struct mr6_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 */
@@ -2269,12 +2270,14 @@ static int __ip6mr_fill_mroute(struct mr6_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;