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authorArun Ajith S <aajith@arista.com>2022-04-15 08:34:02 +0000
committerDavid S. Miller <davem@davemloft.net>2022-04-17 13:23:49 +0100
commitf9a2fb73318eb4dbf8cd84866b8b0dd012d8b116 (patch)
tree1441aad939fad8f1112d3bfb24eec862e472f0ee /net/ipv6/addrconf.c
parent0339d25a2807d913f5645b8d5e485640915f9702 (diff)
net/ipv6: Introduce accept_unsolicited_na knob to implement router-side changes for RFC9131
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>
Diffstat (limited to 'net/ipv6/addrconf.c')
-rw-r--r--net/ipv6/addrconf.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 1afc4c024981..6473dc84b71d 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5587,6 +5587,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
+ array[DEVCONF_ACCEPT_UNSOLICITED_NA] = cnf->accept_unsolicited_na;
}
static inline size_t inet6_ifla6_size(void)
@@ -7038,6 +7039,15 @@ static const struct ctl_table addrconf_sysctl[] = {
.extra2 = (void *)SYSCTL_ONE,
},
{
+ .procname = "accept_unsolicited_na",
+ .data = &ipv6_devconf.accept_unsolicited_na,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ .extra1 = (void *)SYSCTL_ZERO,
+ .extra2 = (void *)SYSCTL_ONE,
+ },
+ {
/* sentinel */
}
};