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authorJames Prestwood <prestwoj@gmail.com>2021-11-01 20:36:29 +0300
committerJakub Kicinski <kuba@kernel.org>2021-11-02 05:57:14 +0300
commit18ac597af25e9760b76471524096f5b29eb820e6 (patch)
treeba2a2bfbb0b0cac7991ac8e0c0fe9656357dc6b6 /include/uapi
parentfcdb44d08a95003c3d040aecdee286156ec6f34e (diff)
downloadlinux-18ac597af25e9760b76471524096f5b29eb820e6.tar.xz
net: ndisc: introduce ndisc_evict_nocarrier sysctl parameter
In most situations the neighbor discovery cache should be cleared on a NOCARRIER event which is currently done unconditionally. But for wireless roams the neighbor discovery cache can and should remain intact since the underlying network has not changed. This patch introduces a sysctl option ndisc_evict_nocarrier which can be disabled by a wireless supplicant during a roam. This allows packets to be sent after a roam immediately without having to wait for neighbor discovery. A user reported roughly a 1 second delay after a roam before packets could be sent out (note, on IPv4). This delay was due to the ARP cache being cleared. During testing of this same scenario using IPv6 no delay was noticed, but regardless there is no reason to clear the ndisc cache for wireless roams. Signed-off-by: James Prestwood <prestwoj@gmail.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/ipv6.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
index b243a53fa985..d4178dace0bf 100644
--- a/include/uapi/linux/ipv6.h
+++ b/include/uapi/linux/ipv6.h
@@ -193,6 +193,7 @@ enum {
DEVCONF_IOAM6_ENABLED,
DEVCONF_IOAM6_ID,
DEVCONF_IOAM6_ID_WIDE,
+ DEVCONF_NDISC_EVICT_NOCARRIER,
DEVCONF_MAX
};