[PATCH 3.16 347/370] igmp: Make igmp group member RFC 3376 compliant

Ben Hutchings
2017-03-10T13:20:41Z

From: Michal Tesar <mtesar@redhat.com>

[ Upstream commit 7ababb782690e03b78657e27bd051e20163af2d6 ]

5.2. Action on Reception of a Query

When a system receives a Query, it does not respond immediately.
Instead, it delays its response by a random amount of time, bounded
by the Max Resp Time value derived from the Max Resp Code in the
received Query message. A system may receive a variety of Queries on
different interfaces and of different kinds (e.g., General Queries,
Group-Specific Queries, and Group-and-Source-Specific Queries), each
of which may require its own delayed response.

Before scheduling a response to a Query, the system must first
consider previously scheduled pending responses and in many cases
schedule a combined response. Therefore, the system must be able to
maintain the following state:

o A timer per interface for scheduling responses to General Queries.

o A per-group and interface timer for scheduling responses to Group-
Specific and Group-and-Source-Specific Queries.

o A per-group and interface list of sources to be reported in the
response to a Group-and-Source-Specific Query.

When a new Query with the Router-Alert option arrives on an
interface, provided the system has state to report, a delay for a
response is randomly selected in the range (0, [Max Resp Time]) where
Max Resp Time is derived from Max Resp Code in the received Query
message. The following rules are then used to determine if a Report
needs to be scheduled and the type of Report to schedule. The rules
are considered in order and only the first matching rule is applied.

1. If there is a pending response to a previous General Query
scheduled sooner than the selected delay, no additional response
needs to be scheduled.

2. If the received Query is a General Query, the interface timer is
used to schedule a response to the General Query after the
selected delay. Any previously pending response to a General
Query is canceled.
--8<--

Currently the timer is rearmed with new random expiration time for
every incoming query regardless of possibly already pending report.
Which is not aligned with the above RFE.
It also might happen that higher rate of incoming queries can
postpone the report after the expiration time of the first query
causing group membership loss.

Now the per interface general query timer is rearmed only
when there is no pending report already scheduled on that interface or
the newly selected expiration time is before the already pending
scheduled report.

Signed-off-by: Michal Tesar <mtesar@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
net/ipv4/igmp.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -221,9 +221,14 @@ static void igmp_start_timer(struct ip_m
static void igmp_gq_start_timer(struct in_device *in_dev)
{
int tv = prandom_u32() % in_dev->mr_maxdelay;
+ unsigned long exp = jiffies + tv + 2;
+
+ if (in_dev->mr_gq_running &&
+ time_after_eq(exp, (in_dev->mr_gq_timer).expires))
+ return;

in_dev->mr_gq_running = 1;
- if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
+ if (!mod_timer(&in_dev->mr_gq_timer, exp))
in_dev_hold(in_dev);
}