netdev - [PATCH net] net: bridge: convert MLDv2 Query MRC into msecs_to_jiffies for max

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Message-Id: <1377813305-11058-1-git-send-email-dborkman@redhat.com>
Date:	Thu, 29 Aug 2013 23:55:05 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org,
	Linus Lüssing <linus.luessing@....de>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: [PATCH net] net: bridge: convert MLDv2 Query MRC into msecs_to_jiffies for max_delay

While looking into MLDv1/v2 code, I noticed that bridging code does
not convert it's max delay into jiffies for MLDv2 messages as we do
in core IPv6' multicast code.

RFC3810, 5.1.3. Maximum Response Code says:

  The Maximum Response Code field specifies the maximum time allowed
  before sending a responding Report. The actual time allowed, called
  the Maximum Response Delay, is represented in units of milliseconds,
  and is derived from the Maximum Response Code as follows: [...]

As we update timers that work with jiffies, we need to convert it.

Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
Cc: Linus Lüssing <linus.luessing@....de>
Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 net/bridge/br_multicast.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 08e576a..08d2921 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1203,7 +1203,8 @@ static int br_ip6_multicast_query(struct net_bridge *br,
 		mld2q = (struct mld2_query *)icmp6_hdr(skb);
 		if (!mld2q->mld2q_nsrcs)
 			group = &mld2q->mld2q_mca;
-		max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(ntohs(mld2q->mld2q_mrc)) : 1;
+
+		max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mld2q->mld2q_mrc))), 1UL);
 	}
 
 	br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr),
-- 
1.7.11.7

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