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ipv4: implement igmp_qrv sysctl to tune igmp robustness variable

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As in IPv6 people might increase the igmp query robustness variable to
make sure unsolicited state change reports aren't lost on the network. Add
and document this new knob to igmp code.

RFCs allow tuning this parameter back to first IGMP RFC, so we also use
this setting for all counters, including source specific multicast.

Also take over sysctl value when upping the interface and don't reuse
the last one seen on the interface.

Cc: Flavio Leitner <fbl@redhat.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa 2014-09-02 15:49:26 +02:00 • committed by David S. Miller
parent 2f711939d2
commit a9fe8e2994
4 changed files with 31 additions and 16 deletions
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1
include/linux/igmp.h
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@ -39,6 +39,7 @@ static inline struct igmpv3_query *
extern int sysctl_igmp_max_memberships;
extern int sysctl_igmp_max_msf;
extern int sysctl_igmp_qrv;
struct ip_sf_socklist {
unsigned int sl_max;