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ipv6: add sysctl_mld_qrv to configure query robustness variable

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This patch adds a new sysctl_mld_qrv knob to configure the mldv1/v2 query
robustness variable. It specifies how many retransmit of unsolicited mld
retransmit should happen. Admins might want to tune this on lossy links.

Also reset mld state on interface down/up, so we pick up new sysctl
settings during interface up event.

IPv6 certification requests this knob to be available.

I didn't make this knob netns specific, as it is mostly a setting in a
physical environment and should be per host.

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 15:49:25 +02:00
committed by David S. Miller
parent b89df95d52
commit 2f711939d2
4 changed files with 31 additions and 10 deletions
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1
include/net/ipv6.h
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@@ -121,6 +121,7 @@ struct frag_hdr {
/* sysctls */
extern int sysctl_mld_max_msf;
extern int sysctl_mld_qrv;
#define _DEVINC(net, statname, modifier, idev, field) \
({ \