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authorJames Prestwood <prestwoj@gmail.com>2021-11-01 10:36:29 -0700
committerJakub Kicinski <kuba@kernel.org>2021-11-01 19:57:14 -0700
commit18ac597af25e9760b76471524096f5b29eb820e6 (patch)
treeba2a2bfbb0b0cac7991ac8e0c0fe9656357dc6b6 /include/linux/ipv6.h
parentfcdb44d08a95003c3d040aecdee286156ec6f34e (diff)
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/linux/ipv6.h')
-rw-r--r--include/linux/ipv6.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index c383630d3f06..20c1f968da7c 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -79,6 +79,7 @@ struct ipv6_devconf {
__u32 ioam6_id;
__u32 ioam6_id_wide;
__u8 ioam6_enabled;
+ __u8 ndisc_evict_nocarrier;
struct ctl_table_header *sysctl_header;
};