net: igmp: Reduce Unsolicited report interval to 1s when using IGMPv3 (cab70040) · Commits · 戴 / test

If an IGMP join packet is lost you will not receive data sent to the multicast group so if no data arrives from that multicast group in a period of time after the IGMP join a second IGMP join will be sent. The delay between joins is the "IGMP Unsolicited Report Interval". Previously this value was hard coded to be chosen randomly between 0-10s. This can be too long for some use-cases, such as IPTV as it can cause channel change to be slow in the presence of packet loss. The value 10s has come from IGMPv2 RFC2236, which was reduced to 1s in IGMPv3 RFC3376. This patch makes the kernel use the 1s value from the later RFC if we are operating in IGMPv3 mode. IGMPv2 behaviour is unaffected. Tested with Wireshark and a simple program to join a (non-existent) multicast group. The distribution of timings for the second join differ based upon setting /proc/sys/net/ipv4/conf/eth0/force_igmp_version. Signed-off-by:

William Manley <william.manley@youview.com> Acked-by:

Hannes Frederic Sowa <hannes@stressinduktion.org> Acked-by:

Benjamin LaHaise <bcrl@kvack.org> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/ipv4/igmp.c

+13 −3

Original line number	Diff line number	Diff line
		@@ -114,7 +114,8 @@

		#define IGMP_V1_Router_Present_Timeout (400*HZ)
		#define IGMP_V2_Router_Present_Timeout (400*HZ)
		#define IGMP_Unsolicited_Report_Interval (10*HZ)
		#define IGMP_V2_Unsolicited_Report_Interval (10*HZ)
		#define IGMP_V3_Unsolicited_Report_Interval (1*HZ)
		#define IGMP_Query_Response_Interval (10*HZ)
		#define IGMP_Unsolicited_Report_Count 2

		@@ -139,6 +140,14 @@
		((in_dev)->mr_v2_seen && \
		time_before(jiffies, (in_dev)->mr_v2_seen)))

		static int unsolicited_report_interval(struct in_device *in_dev)
		{
		if (IGMP_V1_SEEN(in_dev) \|\| IGMP_V2_SEEN(in_dev))
		return IGMP_V2_Unsolicited_Report_Interval;
		else /* v3 */
		return IGMP_V3_Unsolicited_Report_Interval;
		}

		static void igmpv3_add_delrec(struct in_device in_dev, struct ip_mc_list im);
		static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
		static void igmpv3_clear_delrec(struct in_device *in_dev);
		@@ -722,7 +731,8 @@ static void igmp_ifc_timer_expire(unsigned long data)
		igmpv3_send_cr(in_dev);
		if (in_dev->mr_ifc_count) {
		in_dev->mr_ifc_count--;
		igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
		igmp_ifc_start_timer(in_dev,
		unsolicited_report_interval(in_dev));
		}
		__in_dev_put(in_dev);
		}
		@@ -747,7 +757,7 @@ static void igmp_timer_expire(unsigned long data)

		if (im->unsolicit_count) {
		im->unsolicit_count--;
		igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
		igmp_start_timer(im, unsolicited_report_interval(in_dev));
		}
		im->reporter = 1;
		spin_unlock(&im->lock);

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