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net/ipv6: Introduce accept_unsolicited_na knob to implement router-side changes for RFC9131

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Add a new neighbour cache entry in STALE state for routers on receiving
an unsolicited (gratuitous) neighbour advertisement with
target link-layer-address option specified.
This is similar to the arp_accept configuration for IPv4.
A new sysctl endpoint is created to turn on this behaviour:
/proc/sys/net/ipv6/conf/interface/accept_unsolicited_na.

Signed-off-by: Arun Ajith S <aajith@arista.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arun Ajith S
2022-04-15 08:34:02 +00:00
committed by David S. Miller
parent 0339d25a28
commit f9a2fb7331
7 changed files with 314 additions and 1 deletions
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include/uapi/linux/ipv6.h
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@@ -194,6 +194,7 @@ enum {
DEVCONF_IOAM6_ID,
DEVCONF_IOAM6_ID_WIDE,
DEVCONF_NDISC_EVICT_NOCARRIER,
DEVCONF_ACCEPT_UNSOLICITED_NA,
DEVCONF_MAX
};