bonding: fix to rejoin multicast groups immediately (e12b4539) · Commits · 戴 / test

The IGMP specs states that if the system receives a membership report, it shouldn't send another for the next minute. However, if a link failure happens right after that, the backup slave and the switch connected to this slave will not know about the multicast and the traffic will hang for about a minute. This patch fixes it to rejoin multicast groups immediately after a failover restoring the multicast traffic. Signed-off-by:

Flavio Leitner <fleitner@redhat.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/ipv4/igmp.c

+8 −8

Original line number	Diff line number	Diff line
		@@ -1269,14 +1269,14 @@ void ip_mc_rejoin_group(struct ip_mc_list *im)
		if (im->multiaddr == IGMP_ALL_HOSTS)
		return;

		if (IGMP_V1_SEEN(in_dev) \|\| IGMP_V2_SEEN(in_dev)) {
		igmp_mod_timer(im, IGMP_Initial_Report_Delay);
		return;
		}
		/* else, v3 */
		im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
		IGMP_Unsolicited_Report_Count;
		igmp_ifc_event(in_dev);
		/* a failover is happening and switches
		* must be notified immediately */
		if (IGMP_V1_SEEN(in_dev))
		igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
		else if (IGMP_V2_SEEN(in_dev))
		igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
		else
		igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
		#endif
		}
		EXPORT_SYMBOL(ip_mc_rejoin_group);

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