netdev - [PATCH v2] inetpeer: fix token initialization

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Message-Id: <1348755060-3737-1-git-send-email-nicolas.dichtel@6wind.com>
Date:	Thu, 27 Sep 2012 16:11:00 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH v2] inetpeer: fix token initialization

When jiffies wraps around (for example, 5 minutes after the boot, see
INITIAL_JIFFIES) and peer has just been created, now - peer->rate_last can be
< XRLIM_BURST_FACTOR * timeout, so token is not set to the maximum value, thus
some icmp packets can be unexpectedly dropped.

Fix this case by initializing last_rate to 60 seconds in the past.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
v2: fix initialization of peer instead of adding some tests in
    inet_peer_xrlim_allow()

 net/ipv4/inetpeer.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index e1e0a4e..c7527f6 100644
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -510,7 +510,10 @@ relookup:
 					secure_ipv6_id(daddr->addr.a6));
 		p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;
 		p->rate_tokens = 0;
-		p->rate_last = 0;
+		/* 60*HZ is arbitrary, but chosen enough high so that the first
+		 * calculation of tokens is at its maximum.
+		 */
+		p->rate_last = jiffies - 60*HZ;
 		INIT_LIST_HEAD(&p->gc_list);
 
 		/* Link the node. */
-- 
1.7.12

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