shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-05 18:41:58 +09:00
Code Issues Packages Projects Releases Wiki Activity

ipv6: Fix IPv6 packet loss in scenarios involving roaming + snooping switches

Browse Source 
[ Upstream commit a088d1d73a ]

When for instance a mobile Linux device roams from one access point to
another with both APs sharing the same broadcast domain and a
multicast snooping switch in between:

1)    (c) <~~~> (AP1) <--[SSW]--> (AP2)

2)              (AP1) <--[SSW]--> (AP2) <~~~> (c)

Then currently IPv6 multicast packets will get lost for (c) until an
MLD Querier sends its next query message. The packet loss occurs
because upon roaming the Linux host so far stayed silent regarding
MLD and the snooping switch will therefore be unaware of the
multicast topology change for a while.

This patch fixes this by always resending MLD reports when an interface
change happens, for instance from NO-CARRIER to CARRIER state.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Lüssing
2017-05-23 21:53:52 -04:00
committed by Greg Kroah-Hartman
parent d536202202
commit 1cadd394bb
1 changed files with 8 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
net/ipv6/addrconf.c
View File

@@ -3387,9 +3387,15 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
}
if (idev) {
if (idev->if_flags & IF_READY)
/* device is already configured. */
if (idev->if_flags & IF_READY) {
/* device is already configured -
* but resend MLD reports, we might
* have roamed and need to update
* multicast snooping switches
*/
ipv6_mc_up(idev);
break;
}
idev->if_flags |= IF_READY;
}